https://github.com/tgstation/tgstation/pull/49330/ and https://github.com/tgstation/tgstation/pull/49982/

code/modules/asset_cache/asset_cache.dm

@@ -0,0 +1,130 @@
+/*
+Asset cache quick users guide:
+
+Make a datum at the bottom of this file with your assets for your thing.
+The simple subsystem will most like be of use for most cases.
+Then call get_asset_datum() with the type of the datum you created and store the return
+Then call .send(client) on that stored return value.
+
+You can set verify to TRUE if you want send() to sleep until the client has the assets.
+*/
+
+
+// Amount of time(ds) MAX to send per asset, if this get exceeded we cancel the sleeping.
+// This is doubled for the first asset, then added per asset after
+#define ASSET_CACHE_SEND_TIMEOUT 7
+
+//When sending mutiple assets, how many before we give the client a quaint little sending resources message
+#define ASSET_CACHE_TELL_CLIENT_AMOUNT 8
+
+//This proc sends the asset to the client, but only if it needs it.
+//This proc blocks(sleeps) unless verify is set to false
+/proc/send_asset(client/client, asset_name, verify = TRUE)
+	return send_asset_list(client, list(asset_name), verify)
+
+//This proc blocks(sleeps) unless verify is set to false
+/proc/send_asset_list(client/client, list/asset_list, verify = TRUE)
+	if(!istype(client))
+		if(ismob(client))
+			var/mob/M = client
+			if(M.client)
+				client = M.client
+
+			else
+				return FALSE
+
+		else
+			return FALSE
+	
+	var/list/unreceived = list()
+	var/list/sending = list()
+
+	for (var/asset_name in asset_list)
+		var/asset_file = SSassets.cache[asset_name]
+		if (!asset_file)
+			continue
+		
+		var/asset_md5 = md5(asset_file) || md5(fcopy_rsc(asset_file))
+		
+		if (client.sent_assets[asset_name] == asset_md5)
+			continue
+		if (client.sending_assets.Find(asset_name))
+			if (!verify)
+				continue
+			sending += asset_name
+
+		
+		unreceived[asset_name] = asset_md5
+
+	var/t = 0
+	var/timeout_time = DS2TICKS(ASSET_CACHE_SEND_TIMEOUT * client.sending_assets.len)
+
+	if (unreceived.len)
+		if (unreceived.len >= ASSET_CACHE_TELL_CLIENT_AMOUNT)
+			to_chat(client, "Sending Resources...")
+		var/job
+		if (verify)
+			job = ++client.last_asset_job
+		for(var/asset in unreceived)
+			if (SSassets.cache[asset])
+				log_asset("Sending asset [asset] to client [client]")
+				client << browse_rsc(SSassets.cache[asset], asset)
+				if(verify)
+					client.sending_assets[unreceived] = job
+
+		if(!verify)
+			client.sent_assets |= unreceived
+			addtimer(CALLBACK(client, /client/proc/asset_cache_update_json), 1 SECONDS, TIMER_UNIQUE|TIMER_OVERRIDE)
+		else
+
+			client.sending_assets |= unreceived
+
+			client << browse({"<script>window.location.href="?asset_cache_confirm_arrival=[job]"</script>"}, "window=asset_cache_browser&file=asset_cache_send_verify.htm")
+
+			while(client && !client.completed_asset_jobs.Find(job) && t < timeout_time) // Reception is handled in Topic()
+				stoplag(1) // Lock up the caller until this is received.
+				t++
+
+			if(client)
+				client.sending_assets -= unreceived
+				client.sent_assets = unreceived | client.sent_assets //if we sent an updated version of an asset, we would want to replace the md5 in the client's list of sent assets
+				client.completed_asset_jobs -= job
+				addtimer(CALLBACK(client, /client/proc/asset_cache_update_json), 1 SECONDS, TIMER_UNIQUE|TIMER_OVERRIDE)
+
+		. = TRUE
+
+	else if (sending.len) //else if because these things are ordered enough to trust that assets sent later on would have arrived after ones that were already in the queue.
+		for (var/sending_asset in sending)
+			var/sending_asset_jobid = client?.sending_assets[sending_asset]
+			if (!sending_asset_jobid)
+				continue
+
+			while(client && client.last_completed_asset_job < sending_asset_jobid && t < timeout_time) // Reception is handled in Topic()
+				stoplag(1) // Lock up the caller until this is received.
+				t++
+
+		. = TRUE
+
+//This proc will download the files without clogging up the browse() queue, used for passively sending files on connection start.
+//The proc calls procs that sleep for long times.
+/proc/getFilesSlow(client/client, list/files, register_asset = TRUE)
+	for(var/file in files)
+		if (!client)
+			break
+		if (register_asset)
+			register_asset(file, files[file])
+
+		if (send_asset(client, file))
+			stoplag(0) //queuing calls like this too quickly can cause issues in some client versions
+
+//This proc "registers" an asset, it adds it to the cache for further use, you cannot touch it from this point on or you'll fuck things up.
+//if it's an icon or something be careful, you'll have to copy it before further use.
+/proc/register_asset(asset_name, asset)
+	SSassets.cache[asset_name] = asset
+
+//Generated names do not include file extention.
+//Used mainly for code that deals with assets in a generic way
+//The same asset will always lead to the same asset name
+/proc/generate_asset_name(file)
+	return "asset.[md5(fcopy_rsc(file))]"
+

code/modules/asset_cache/asset_cache_client.dm

@@ -0,0 +1,43 @@
+
+/client
+	var/list/sent_assets = list() // List of all asset filenames sent to this client by the asset cache, along with their assoicated md5s
+	var/list/completed_asset_jobs = list() /// List of all completed blocking send jobs awaiting acknowledgement by send_asset
+	var/list/sending_assets = list() /// List of all assets currently being sent in blocking mode
+	var/last_asset_job = 0 /// Last asset send job id.
+	var/last_completed_asset_job = 0
+
+/// Process asset cache client topic calls for "asset_cache_confirm_arrival=[INT]"
+/client/proc/asset_cache_confirm_arrival(job_id)
+	var/asset_cache_job = round(text2num(job_id))
+		//because we skip the limiter, we have to make sure this is a valid arrival and not somebody tricking us into letting them append to a list without limit.
+	if (asset_cache_job > 0 && asset_cache_job <= last_asset_job && !(asset_cache_job in completed_asset_jobs))
+		completed_asset_jobs += asset_cache_job
+		last_completed_asset_job = max(last_completed_asset_job, asset_cache_job)
+	else
+		return asset_cache_job || TRUE
+
+
+/// Process asset cache client topic calls for "asset_cache_preload_data=[HTML+JSON_STRING]
+/client/proc/asset_cache_preload_data(data)
+	/*var/jsonend = findtextEx(data, "{{{ENDJSONDATA}}}")
+	if (!jsonend)
+		CRASH("invalid asset_cache_preload_data, no jsonendmarker")*/
+	//var/json = html_decode(copytext(data, 1, jsonend))
+	var/json = data
+	var/list/preloaded_assets = json_decode(json)
+
+	for (var/preloaded_asset in preloaded_assets)
+		if (copytext(preloaded_asset, findlasttext(preloaded_asset, ".")+1) in list("js", "jsm", "htm", "html"))
+			preloaded_assets -= preloaded_asset
+			continue
+	sent_assets |= preloaded_assets
+
+//Updates the client side stored html/json combo file used to keep track of what assets the client has between restarts/reconnects.
+
+/client/proc/asset_cache_update_json(verify = FALSE, list/new_assets = list())
+	if (world.time - connection_time < 10 SECONDS) //don't override the existing data file on a new connection
+		return
+	if (!islist(new_assets))
+		new_assets = list("[new_assets]" = md5(SSassets.cache[new_assets]))
+
+	src << browse(json_encode(new_assets|sent_assets), "file=asset_data.json&display=0")

code/modules/asset_cache/asset_list.dm

@@ -0,0 +1,234 @@
+
+//These datums are used to populate the asset cache, the proc "register()" does this.
+//Place any asset datums you create in asset_list_items.dm
+
+//all of our asset datums, used for referring to these later
+GLOBAL_LIST_EMPTY(asset_datums)
+
+//get an assetdatum or make a new one
+/proc/get_asset_datum(type)
+	return GLOB.asset_datums[type] || new type()
+
+/datum/asset
+	var/_abstract = /datum/asset
+
+/datum/asset/New()
+	GLOB.asset_datums[type] = src
+	register()
+
+/datum/asset/proc/register()
+	return
+
+/datum/asset/proc/send(client)
+	return
+
+
+//If you don't need anything complicated.
+/datum/asset/simple
+	_abstract = /datum/asset/simple
+	var/assets = list()
+	var/verify = FALSE
+
+/datum/asset/simple/register()
+	for(var/asset_name in assets)
+		register_asset(asset_name, assets[asset_name])
+
+/datum/asset/simple/send(client)
+	send_asset_list(client,assets,verify)
+
+
+// For registering or sending multiple others at once
+/datum/asset/group
+	_abstract = /datum/asset/group
+	var/list/children
+
+/datum/asset/group/register()
+	for(var/type in children)
+		get_asset_datum(type)
+
+/datum/asset/group/send(client/C)
+	for(var/type in children)
+		var/datum/asset/A = get_asset_datum(type)
+		A.send(C)
+
+
+// spritesheet implementation - coalesces various icons into a single .png file
+// and uses CSS to select icons out of that file - saves on transferring some
+// 1400-odd individual PNG files
+#define SPR_SIZE 1
+#define SPR_IDX 2
+#define SPRSZ_COUNT 1
+#define SPRSZ_ICON 2
+#define SPRSZ_STRIPPED 3
+
+/datum/asset/spritesheet
+	_abstract = /datum/asset/spritesheet
+	var/name
+	var/list/sizes = list()    // "32x32" -> list(10, icon/normal, icon/stripped)
+	var/list/sprites = list()  // "foo_bar" -> list("32x32", 5)
+	var/verify = FALSE
+
+/datum/asset/spritesheet/register()
+	if (!name)
+		CRASH("spritesheet [type] cannot register without a name")
+	ensure_stripped()
+
+	var/res_name = "spritesheet_[name].css"
+	var/fname = "data/spritesheets/[res_name]"
+	fdel(fname)
+	text2file(generate_css(), fname)
+	register_asset(res_name, fcopy_rsc(fname))
+	fdel(fname)
+
+	for(var/size_id in sizes)
+		var/size = sizes[size_id]
+		register_asset("[name]_[size_id].png", size[SPRSZ_STRIPPED])
+
+/datum/asset/spritesheet/send(client/C)
+	if (!name)
+		return
+	var/all = list("spritesheet_[name].css")
+	for(var/size_id in sizes)
+		all += "[name]_[size_id].png"
+	send_asset_list(C, all, verify)
+
+/datum/asset/spritesheet/proc/ensure_stripped(sizes_to_strip = sizes)
+	for(var/size_id in sizes_to_strip)
+		var/size = sizes[size_id]
+		if (size[SPRSZ_STRIPPED])
+			continue
+
+		// save flattened version
+		var/fname = "data/spritesheets/[name]_[size_id].png"
+		fcopy(size[SPRSZ_ICON], fname)
+		var/error = rustg_dmi_strip_metadata(fname)
+		if(length(error))
+			stack_trace("Failed to strip [name]_[size_id].png: [error]")
+		size[SPRSZ_STRIPPED] = icon(fname)
+		fdel(fname)
+
+/datum/asset/spritesheet/proc/generate_css()
+	var/list/out = list()
+
+	for (var/size_id in sizes)
+		var/size = sizes[size_id]
+		var/icon/tiny = size[SPRSZ_ICON]
+		out += ".[name][size_id]{display:inline-block;width:[tiny.Width()]px;height:[tiny.Height()]px;background:url('[name]_[size_id].png') no-repeat;}"
+
+	for (var/sprite_id in sprites)
+		var/sprite = sprites[sprite_id]
+		var/size_id = sprite[SPR_SIZE]
+		var/idx = sprite[SPR_IDX]
+		var/size = sizes[size_id]
+
+		var/icon/tiny = size[SPRSZ_ICON]
+		var/icon/big = size[SPRSZ_STRIPPED]
+		var/per_line = big.Width() / tiny.Width()
+		var/x = (idx % per_line) * tiny.Width()
+		var/y = round(idx / per_line) * tiny.Height()
+
+		out += ".[name][size_id].[sprite_id]{background-position:-[x]px -[y]px;}"
+
+	return out.Join("\n")
+
+/datum/asset/spritesheet/proc/Insert(sprite_name, icon/I, icon_state="", dir=SOUTH, frame=1, moving=FALSE)
+	I = icon(I, icon_state=icon_state, dir=dir, frame=frame, moving=moving)
+	if (!I || !length(icon_states(I)))  // that direction or state doesn't exist
+		return
+	var/size_id = "[I.Width()]x[I.Height()]"
+	var/size = sizes[size_id]
+
+	if (sprites[sprite_name])
+		CRASH("duplicate sprite \"[sprite_name]\" in sheet [name] ([type])")
+
+	if (size)
+		var/position = size[SPRSZ_COUNT]++
+		var/icon/sheet = size[SPRSZ_ICON]
+		size[SPRSZ_STRIPPED] = null
+		sheet.Insert(I, icon_state=sprite_name)
+		sprites[sprite_name] = list(size_id, position)
+	else
+		sizes[size_id] = size = list(1, I, null)
+		sprites[sprite_name] = list(size_id, 0)
+
+/datum/asset/spritesheet/proc/InsertAll(prefix, icon/I, list/directions)
+	if (length(prefix))
+		prefix = "[prefix]-"
+
+	if (!directions)
+		directions = list(SOUTH)
+
+	for (var/icon_state_name in icon_states(I))
+		for (var/direction in directions)
+			var/prefix2 = (directions.len > 1) ? "[dir2text(direction)]-" : ""
+			Insert("[prefix][prefix2][icon_state_name]", I, icon_state=icon_state_name, dir=direction)
+
+/datum/asset/spritesheet/proc/css_tag()
+	return {"<link rel="stylesheet" href="spritesheet_[name].css" />"}
+
+/datum/asset/spritesheet/proc/icon_tag(sprite_name)
+	var/sprite = sprites[sprite_name]
+	if (!sprite)
+		return null
+	var/size_id = sprite[SPR_SIZE]
+	return {"<span class="[name][size_id] [sprite_name]"></span>"}
+
+/datum/asset/spritesheet/proc/icon_class_name(sprite_name)
+	var/sprite = sprites[sprite_name]
+	if (!sprite)
+		return null
+	var/size_id = sprite[SPR_SIZE]
+	return {"[name][size_id] [sprite_name]"}
+
+#undef SPR_SIZE
+#undef SPR_IDX
+#undef SPRSZ_COUNT
+#undef SPRSZ_ICON
+#undef SPRSZ_STRIPPED
+
+
+/datum/asset/spritesheet/simple
+	_abstract = /datum/asset/spritesheet/simple
+	var/list/assets
+
+/datum/asset/spritesheet/simple/register()
+	for (var/key in assets)
+		Insert(key, assets[key])
+	..()
+
+//Generates assets based on iconstates of a single icon
+/datum/asset/simple/icon_states
+	_abstract = /datum/asset/simple/icon_states
+	var/icon
+	var/list/directions = list(SOUTH)
+	var/frame = 1
+	var/movement_states = FALSE
+
+	var/prefix = "default" //asset_name = "[prefix].[icon_state_name].png"
+	var/generic_icon_names = FALSE //generate icon filenames using generate_asset_name() instead the above format
+
+	verify = FALSE
+
+/datum/asset/simple/icon_states/register(_icon = icon)
+	for(var/icon_state_name in icon_states(_icon))
+		for(var/direction in directions)
+			var/asset = icon(_icon, icon_state_name, direction, frame, movement_states)
+			if (!asset)
+				continue
+			asset = fcopy_rsc(asset) //dedupe
+			var/prefix2 = (directions.len > 1) ? "[dir2text(direction)]." : ""
+			var/asset_name = sanitize_filename("[prefix].[prefix2][icon_state_name].png")
+			if (generic_icon_names)
+				asset_name = "[generate_asset_name(asset)].png"
+
+			register_asset(asset_name, asset)
+
+/datum/asset/simple/icon_states/multiple_icons
+	_abstract = /datum/asset/simple/icon_states/multiple_icons
+	var/list/icons
+
+/datum/asset/simple/icon_states/multiple_icons/register()
+	for(var/i in icons)
+		..(i)
+
+

code/modules/asset_cache/asset_list_items.dm

@@ -0,0 +1,372 @@
+//DEFINITIONS FOR ASSET DATUMS START HERE.
+
+/datum/asset/simple/tgui
+	assets = list(
+		"tgui.bundle.js" = 'tgui/packages/tgui/public/tgui.bundle.js',
+		"tgui.bundle.css" = 'tgui/packages/tgui/public/tgui.bundle.css',
+	)
+
+/datum/asset/group/tgui
+	children = list(
+		/datum/asset/simple/tgui,
+		/datum/asset/simple/fontawesome
+	)
+
+/datum/asset/simple/headers
+	assets = list(
+		"alarm_green.gif" 			= 'icons/program_icons/alarm_green.gif',
+		"alarm_red.gif" 			= 'icons/program_icons/alarm_red.gif',
+		"batt_5.gif" 				= 'icons/program_icons/batt_5.gif',
+		"batt_20.gif" 				= 'icons/program_icons/batt_20.gif',
+		"batt_40.gif" 				= 'icons/program_icons/batt_40.gif',
+		"batt_60.gif" 				= 'icons/program_icons/batt_60.gif',
+		"batt_80.gif" 				= 'icons/program_icons/batt_80.gif',
+		"batt_100.gif" 				= 'icons/program_icons/batt_100.gif',
+		"charging.gif" 				= 'icons/program_icons/charging.gif',
+		"downloader_finished.gif" 	= 'icons/program_icons/downloader_finished.gif',
+		"downloader_running.gif" 	= 'icons/program_icons/downloader_running.gif',
+		"ntnrc_idle.gif"			= 'icons/program_icons/ntnrc_idle.gif',
+		"ntnrc_new.gif"				= 'icons/program_icons/ntnrc_new.gif',
+		"power_norm.gif"			= 'icons/program_icons/power_norm.gif',
+		"power_warn.gif"			= 'icons/program_icons/power_warn.gif',
+		"sig_high.gif" 				= 'icons/program_icons/sig_high.gif',
+		"sig_low.gif" 				= 'icons/program_icons/sig_low.gif',
+		"sig_lan.gif" 				= 'icons/program_icons/sig_lan.gif',
+		"sig_none.gif" 				= 'icons/program_icons/sig_none.gif',
+		"smmon_0.gif" 				= 'icons/program_icons/smmon_0.gif',
+		"smmon_1.gif" 				= 'icons/program_icons/smmon_1.gif',
+		"smmon_2.gif" 				= 'icons/program_icons/smmon_2.gif',
+		"smmon_3.gif" 				= 'icons/program_icons/smmon_3.gif',
+		"smmon_4.gif" 				= 'icons/program_icons/smmon_4.gif',
+		"smmon_5.gif" 				= 'icons/program_icons/smmon_5.gif',
+		"smmon_6.gif" 				= 'icons/program_icons/smmon_6.gif',
+		"borg_mon.gif"				= 'icons/program_icons/borg_mon.gif'
+	)
+
+/datum/asset/spritesheet/simple/pda
+	name = "pda"
+	assets = list(
+		"atmos"			= 'icons/pda_icons/pda_atmos.png',
+		"back"			= 'icons/pda_icons/pda_back.png',
+		"bell"			= 'icons/pda_icons/pda_bell.png',
+		"blank"			= 'icons/pda_icons/pda_blank.png',
+		"boom"			= 'icons/pda_icons/pda_boom.png',
+		"bucket"		= 'icons/pda_icons/pda_bucket.png',
+		"medbot"		= 'icons/pda_icons/pda_medbot.png',
+		"floorbot"		= 'icons/pda_icons/pda_floorbot.png',
+		"cleanbot"		= 'icons/pda_icons/pda_cleanbot.png',
+		"crate"			= 'icons/pda_icons/pda_crate.png',
+		"cuffs"			= 'icons/pda_icons/pda_cuffs.png',
+		"eject"			= 'icons/pda_icons/pda_eject.png',
+		"flashlight"	= 'icons/pda_icons/pda_flashlight.png',
+		"honk"			= 'icons/pda_icons/pda_honk.png',
+		"mail"			= 'icons/pda_icons/pda_mail.png',
+		"medical"		= 'icons/pda_icons/pda_medical.png',
+		"menu"			= 'icons/pda_icons/pda_menu.png',
+		"mule"			= 'icons/pda_icons/pda_mule.png',
+		"notes"			= 'icons/pda_icons/pda_notes.png',
+		"power"			= 'icons/pda_icons/pda_power.png',
+		"rdoor"			= 'icons/pda_icons/pda_rdoor.png',
+		"reagent"		= 'icons/pda_icons/pda_reagent.png',
+		"refresh"		= 'icons/pda_icons/pda_refresh.png',
+		"scanner"		= 'icons/pda_icons/pda_scanner.png',
+		"signaler"		= 'icons/pda_icons/pda_signaler.png',
+		"status"		= 'icons/pda_icons/pda_status.png',
+		"dronephone"	= 'icons/pda_icons/pda_dronephone.png',
+		"emoji"			= 'icons/pda_icons/pda_emoji.png'
+	)
+
+/datum/asset/spritesheet/simple/paper
+	name = "paper"
+	assets = list(
+		"stamp-clown" = 'icons/stamp_icons/large_stamp-clown.png',
+		"stamp-deny" = 'icons/stamp_icons/large_stamp-deny.png',
+		"stamp-ok" = 'icons/stamp_icons/large_stamp-ok.png',
+		"stamp-hop" = 'icons/stamp_icons/large_stamp-hop.png',
+		"stamp-cmo" = 'icons/stamp_icons/large_stamp-cmo.png',
+		"stamp-ce" = 'icons/stamp_icons/large_stamp-ce.png',
+		"stamp-hos" = 'icons/stamp_icons/large_stamp-hos.png',
+		"stamp-rd" = 'icons/stamp_icons/large_stamp-rd.png',
+		"stamp-cap" = 'icons/stamp_icons/large_stamp-cap.png',
+		"stamp-qm" = 'icons/stamp_icons/large_stamp-qm.png',
+		"stamp-law" = 'icons/stamp_icons/large_stamp-law.png'
+	)
+
+
+/datum/asset/simple/IRV
+	assets = list(
+		"jquery-ui.custom-core-widgit-mouse-sortable-min.js" = 'html/IRV/jquery-ui.custom-core-widgit-mouse-sortable-min.js',
+	)
+
+/datum/asset/group/IRV
+	children = list(
+		/datum/asset/simple/jquery,
+		/datum/asset/simple/IRV
+	)
+
+/datum/asset/simple/changelog
+	assets = list(
+		"88x31.png" = 'html/88x31.png',
+		"bug-minus.png" = 'html/bug-minus.png',
+		"cross-circle.png" = 'html/cross-circle.png',
+		"hard-hat-exclamation.png" = 'html/hard-hat-exclamation.png',
+		"image-minus.png" = 'html/image-minus.png',
+		"image-plus.png" = 'html/image-plus.png',
+		"music-minus.png" = 'html/music-minus.png',
+		"music-plus.png" = 'html/music-plus.png',
+		"tick-circle.png" = 'html/tick-circle.png',
+		"wrench-screwdriver.png" = 'html/wrench-screwdriver.png',
+		"spell-check.png" = 'html/spell-check.png',
+		"burn-exclamation.png" = 'html/burn-exclamation.png',
+		"chevron.png" = 'html/chevron.png',
+		"chevron-expand.png" = 'html/chevron-expand.png',
+		"scales.png" = 'html/scales.png',
+		"coding.png" = 'html/coding.png',
+		"ban.png" = 'html/ban.png',
+		"chrome-wrench.png" = 'html/chrome-wrench.png',
+		"changelog.css" = 'html/changelog.css'
+	)
+
+/datum/asset/group/goonchat
+	children = list(
+		/datum/asset/simple/jquery,
+		/datum/asset/simple/goonchat,
+		/datum/asset/spritesheet/goonchat,
+		/datum/asset/simple/fontawesome
+	)
+
+/datum/asset/simple/jquery
+	verify = FALSE
+	assets = list(
+		"jquery.min.js"            = 'code/modules/goonchat/browserassets/js/jquery.min.js',
+	)
+
+/datum/asset/simple/goonchat
+	verify = FALSE
+	assets = list(
+		"json2.min.js"             = 'code/modules/goonchat/browserassets/js/json2.min.js',
+		"browserOutput.js"         = 'code/modules/goonchat/browserassets/js/browserOutput.js',
+		"browserOutput.css"	       = 'code/modules/goonchat/browserassets/css/browserOutput.css',
+		"browserOutput_white.css"  = 'code/modules/goonchat/browserassets/css/browserOutput_white.css',
+	)
+
+/datum/asset/simple/fontawesome
+	verify = FALSE
+	assets = list(
+		"fa-regular-400.eot"  = 'html/font-awesome/webfonts/fa-regular-400.eot',
+		"fa-regular-400.woff" = 'html/font-awesome/webfonts/fa-regular-400.woff',
+		"fa-solid-900.eot"    = 'html/font-awesome/webfonts/fa-solid-900.eot',
+		"fa-solid-900.woff"   = 'html/font-awesome/webfonts/fa-solid-900.woff',
+		"font-awesome.css"    = 'html/font-awesome/css/all.min.css',
+		"v4shim.css"          = 'html/font-awesome/css/v4-shims.min.css'
+	)
+
+/datum/asset/spritesheet/goonchat
+	name = "chat"
+
+/datum/asset/spritesheet/goonchat/register()
+	InsertAll("emoji", 'icons/emoji.dmi')
+
+	// pre-loading all lanugage icons also helps to avoid meta
+	InsertAll("language", 'icons/misc/language.dmi')
+	// catch languages which are pulling icons from another file
+	for(var/path in typesof(/datum/language))
+		var/datum/language/L = path
+		var/icon = initial(L.icon)
+		if (icon != 'icons/misc/language.dmi')
+			var/icon_state = initial(L.icon_state)
+			Insert("language-[icon_state]", icon, icon_state=icon_state)
+
+	..()
+
+/datum/asset/simple/permissions
+	assets = list(
+		"padlock.png"	= 'html/padlock.png'
+	)
+
+/datum/asset/simple/notes
+	assets = list(
+		"high_button.png" = 'html/high_button.png',
+		"medium_button.png" = 'html/medium_button.png',
+		"minor_button.png" = 'html/minor_button.png',
+		"none_button.png" = 'html/none_button.png',
+	)
+
+/datum/asset/simple/arcade
+	assets = list(
+		"boss1.gif" = 'icons/UI_Icons/Arcade/boss1.gif',
+		"boss2.gif" = 'icons/UI_Icons/Arcade/boss2.gif',
+		"boss3.gif" = 'icons/UI_Icons/Arcade/boss3.gif',
+		"boss4.gif" = 'icons/UI_Icons/Arcade/boss4.gif',
+		"boss5.gif" = 'icons/UI_Icons/Arcade/boss5.gif',
+		"boss6.gif" = 'icons/UI_Icons/Arcade/boss6.gif',
+		)
+
+/datum/asset/spritesheet/simple/achievements
+	name ="achievements"
+	assets = list(
+		"default" = 'icons/UI_Icons/Achievements/default.png',
+		"basemisc" = 'icons/UI_Icons/Achievements/basemisc.png',
+		"baseboss" = 'icons/UI_Icons/Achievements/baseboss.png',
+		"baseskill" = 'icons/UI_Icons/Achievements/baseskill.png',
+		"bbgum" = 'icons/UI_Icons/Achievements/Boss/bbgum.png',
+		"colossus" = 'icons/UI_Icons/Achievements/Boss/colossus.png',
+		"hierophant" = 'icons/UI_Icons/Achievements/Boss/hierophant.png',
+		"legion" = 'icons/UI_Icons/Achievements/Boss/legion.png',
+		"miner" = 'icons/UI_Icons/Achievements/Boss/miner.png',
+		"swarmer" = 'icons/UI_Icons/Achievements/Boss/swarmer.png',
+		"tendril" = 'icons/UI_Icons/Achievements/Boss/tendril.png',
+		"featofstrength" = 'icons/UI_Icons/Achievements/Misc/featofstrength.png',
+		"helbital" = 'icons/UI_Icons/Achievements/Misc/helbital.png',
+		"jackpot" = 'icons/UI_Icons/Achievements/Misc/jackpot.png',
+		"meteors" = 'icons/UI_Icons/Achievements/Misc/meteors.png',
+		"timewaste" = 'icons/UI_Icons/Achievements/Misc/timewaste.png',
+		"upgrade" = 'icons/UI_Icons/Achievements/Misc/upgrade.png',
+		"clownking" = 'icons/UI_Icons/Achievements/Misc/clownking.png',
+		"clownthanks" = 'icons/UI_Icons/Achievements/Misc/clownthanks.png',
+		"rule8" = 'icons/UI_Icons/Achievements/Misc/rule8.png',
+		"snail" = 'icons/UI_Icons/Achievements/Misc/snail.png',
+		"mining" = 'icons/UI_Icons/Achievements/Skills/mining.png',
+	)
+
+/datum/asset/spritesheet/simple/pills
+	name ="pills"
+	assets = list(
+		"pill1" = 'icons/UI_Icons/Pills/pill1.png',
+		"pill2" = 'icons/UI_Icons/Pills/pill2.png',
+		"pill3" = 'icons/UI_Icons/Pills/pill3.png',
+		"pill4" = 'icons/UI_Icons/Pills/pill4.png',
+		"pill5" = 'icons/UI_Icons/Pills/pill5.png',
+		"pill6" = 'icons/UI_Icons/Pills/pill6.png',
+		"pill7" = 'icons/UI_Icons/Pills/pill7.png',
+		"pill8" = 'icons/UI_Icons/Pills/pill8.png',
+		"pill9" = 'icons/UI_Icons/Pills/pill9.png',
+		"pill10" = 'icons/UI_Icons/Pills/pill10.png',
+		"pill11" = 'icons/UI_Icons/Pills/pill11.png',
+		"pill12" = 'icons/UI_Icons/Pills/pill12.png',
+		"pill13" = 'icons/UI_Icons/Pills/pill13.png',
+		"pill14" = 'icons/UI_Icons/Pills/pill14.png',
+		"pill15" = 'icons/UI_Icons/Pills/pill15.png',
+		"pill16" = 'icons/UI_Icons/Pills/pill16.png',
+		"pill17" = 'icons/UI_Icons/Pills/pill17.png',
+		"pill18" = 'icons/UI_Icons/Pills/pill18.png',
+		"pill19" = 'icons/UI_Icons/Pills/pill19.png',
+		"pill20" = 'icons/UI_Icons/Pills/pill20.png',
+		"pill21" = 'icons/UI_Icons/Pills/pill21.png',
+		"pill22" = 'icons/UI_Icons/Pills/pill22.png',
+	)
+
+//this exists purely to avoid meta by pre-loading all language icons.
+/datum/asset/language/register()
+	for(var/path in typesof(/datum/language))
+		set waitfor = FALSE
+		var/datum/language/L = new path ()
+		L.get_icon()
+
+/datum/asset/spritesheet/pipes
+	name = "pipes"
+
+/datum/asset/spritesheet/pipes/register()
+	for (var/each in list('icons/obj/atmospherics/pipes/pipe_item.dmi', 'icons/obj/atmospherics/pipes/disposal.dmi', 'icons/obj/atmospherics/pipes/transit_tube.dmi', 'icons/obj/plumbing/fluid_ducts.dmi'))
+		InsertAll("", each, GLOB.alldirs)
+	..()
+
+// Representative icons for each research design
+/datum/asset/spritesheet/research_designs
+	name = "design"
+
+/datum/asset/spritesheet/research_designs/register()
+	for (var/path in subtypesof(/datum/design))
+		var/datum/design/D = path
+
+		var/icon_file
+		var/icon_state
+		var/icon/I
+
+		if(initial(D.research_icon) && initial(D.research_icon_state)) //If the design has an icon replacement skip the rest
+			icon_file = initial(D.research_icon)
+			icon_state = initial(D.research_icon_state)
+			if(!(icon_state in icon_states(icon_file)))
+				warning("design [D] with icon '[icon_file]' missing state '[icon_state]'")
+				continue
+			I = icon(icon_file, icon_state, SOUTH)
+
+		else
+			// construct the icon and slap it into the resource cache
+			var/atom/item = initial(D.build_path)
+			if (!ispath(item, /atom))
+				// biogenerator outputs to beakers by default
+				if (initial(D.build_type) & BIOGENERATOR)
+					item = /obj/item/reagent_containers/glass/beaker/large
+				else
+					continue  // shouldn't happen, but just in case
+
+			// circuit boards become their resulting machines or computers
+			if (ispath(item, /obj/item/circuitboard))
+				var/obj/item/circuitboard/C = item
+				var/machine = initial(C.build_path)
+				if (machine)
+					item = machine
+
+			icon_file = initial(item.icon)
+			icon_state = initial(item.icon_state)
+
+			if(!(icon_state in icon_states(icon_file)))
+				warning("design [D] with icon '[icon_file]' missing state '[icon_state]'")
+				continue
+			I = icon(icon_file, icon_state, SOUTH)
+
+			// computers (and snowflakes) get their screen and keyboard sprites
+			if (ispath(item, /obj/machinery/computer) || ispath(item, /obj/machinery/power/solar_control))
+				var/obj/machinery/computer/C = item
+				var/screen = initial(C.icon_screen)
+				var/keyboard = initial(C.icon_keyboard)
+				var/all_states = icon_states(icon_file)
+				if (screen && (screen in all_states))
+					I.Blend(icon(icon_file, screen, SOUTH), ICON_OVERLAY)
+				if (keyboard && (keyboard in all_states))
+					I.Blend(icon(icon_file, keyboard, SOUTH), ICON_OVERLAY)
+
+		Insert(initial(D.id), I)
+	return ..()
+
+/datum/asset/spritesheet/vending
+	name = "vending"
+
+/datum/asset/spritesheet/vending/register()
+	for (var/k in GLOB.vending_products)
+		var/atom/item = k
+		if (!ispath(item, /atom))
+			continue
+
+		var/icon_file = initial(item.icon)
+		var/icon_state = initial(item.icon_state)
+		var/icon/I
+
+		var/icon_states_list = icon_states(icon_file)
+		if(icon_state in icon_states_list)
+			I = icon(icon_file, icon_state, SOUTH)
+			var/c = initial(item.color)
+			if (!isnull(c) && c != "#FFFFFF")
+				I.Blend(c, ICON_MULTIPLY)
+		else
+			var/icon_states_string
+			for (var/an_icon_state in icon_states_list)
+				if (!icon_states_string)
+					icon_states_string = "[json_encode(an_icon_state)](\ref[an_icon_state])"
+				else
+					icon_states_string += ", [json_encode(an_icon_state)](\ref[an_icon_state])"
+			stack_trace("[item] does not have a valid icon state, icon=[icon_file], icon_state=[json_encode(icon_state)](\ref[icon_state]), icon_states=[icon_states_string]")
+			I = icon('icons/turf/floors.dmi', "", SOUTH)
+
+		var/imgid = replacetext(replacetext("[item]", "/obj/item/", ""), "/", "-")
+
+		Insert(imgid, I)
+	return ..()
+
+/datum/asset/simple/genetics
+	assets = list(
+		"dna_discovered.gif"	= 'html/dna_discovered.gif',
+		"dna_undiscovered.gif"	= 'html/dna_undiscovered.gif',
+		"dna_extra.gif" 		= 'html/dna_extra.gif'
+	)

code/modules/asset_cache/validate_assets.html

@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html lang="en">
+	<head>
+		<meta http-equiv="X-UA-Compatible" content="IE=edge" />
+	</head>
+	<body>
+		<script>
+			//this is used over window.location because window.location has a character limit in IE.
+			function sendbyond(text) {
+				var xhr = new XMLHttpRequest();
+				xhr.open('GET', '?'+text, true);
+				xhr.send(null);
+			}
+			var xhr = new XMLHttpRequest();
+			xhr.open('GET', 'asset_data.json', true);
+			xhr.responseType = 'text';
+			xhr.onreadystatechange = function () {
+				if (xhr.readyState === 4) {
+					var status = xhr.status;
+    				if (status >= 200 && status < 400) {
+						sendbyond('asset_cache_preload_data=' + encodeURIComponent(xhr.responseText));
+					}
+				}
+			};
+			xhr.send(null);
+			</script>
+	
+</body>
+</html>

code/modules/client/asset_cache_client.dm

@@ -0,0 +1,372 @@
+//DEFINITIONS FOR ASSET DATUMS START HERE.
+
+/datum/asset/simple/tgui
+	assets = list(
+		"tgui.bundle.js" = 'tgui/packages/tgui/public/tgui.bundle.js',
+		"tgui.bundle.css" = 'tgui/packages/tgui/public/tgui.bundle.css',
+	)
+
+/datum/asset/group/tgui
+	children = list(
+		/datum/asset/simple/tgui,
+		/datum/asset/simple/fontawesome
+	)
+
+/datum/asset/simple/headers
+	assets = list(
+		"alarm_green.gif" 			= 'icons/program_icons/alarm_green.gif',
+		"alarm_red.gif" 			= 'icons/program_icons/alarm_red.gif',
+		"batt_5.gif" 				= 'icons/program_icons/batt_5.gif',
+		"batt_20.gif" 				= 'icons/program_icons/batt_20.gif',
+		"batt_40.gif" 				= 'icons/program_icons/batt_40.gif',
+		"batt_60.gif" 				= 'icons/program_icons/batt_60.gif',
+		"batt_80.gif" 				= 'icons/program_icons/batt_80.gif',
+		"batt_100.gif" 				= 'icons/program_icons/batt_100.gif',
+		"charging.gif" 				= 'icons/program_icons/charging.gif',
+		"downloader_finished.gif" 	= 'icons/program_icons/downloader_finished.gif',
+		"downloader_running.gif" 	= 'icons/program_icons/downloader_running.gif',
+		"ntnrc_idle.gif"			= 'icons/program_icons/ntnrc_idle.gif',
+		"ntnrc_new.gif"				= 'icons/program_icons/ntnrc_new.gif',
+		"power_norm.gif"			= 'icons/program_icons/power_norm.gif',
+		"power_warn.gif"			= 'icons/program_icons/power_warn.gif',
+		"sig_high.gif" 				= 'icons/program_icons/sig_high.gif',
+		"sig_low.gif" 				= 'icons/program_icons/sig_low.gif',
+		"sig_lan.gif" 				= 'icons/program_icons/sig_lan.gif',
+		"sig_none.gif" 				= 'icons/program_icons/sig_none.gif',
+		"smmon_0.gif" 				= 'icons/program_icons/smmon_0.gif',
+		"smmon_1.gif" 				= 'icons/program_icons/smmon_1.gif',
+		"smmon_2.gif" 				= 'icons/program_icons/smmon_2.gif',
+		"smmon_3.gif" 				= 'icons/program_icons/smmon_3.gif',
+		"smmon_4.gif" 				= 'icons/program_icons/smmon_4.gif',
+		"smmon_5.gif" 				= 'icons/program_icons/smmon_5.gif',
+		"smmon_6.gif" 				= 'icons/program_icons/smmon_6.gif',
+		"borg_mon.gif"				= 'icons/program_icons/borg_mon.gif'
+	)
+
+/datum/asset/spritesheet/simple/pda
+	name = "pda"
+	assets = list(
+		"atmos"			= 'icons/pda_icons/pda_atmos.png',
+		"back"			= 'icons/pda_icons/pda_back.png',
+		"bell"			= 'icons/pda_icons/pda_bell.png',
+		"blank"			= 'icons/pda_icons/pda_blank.png',
+		"boom"			= 'icons/pda_icons/pda_boom.png',
+		"bucket"		= 'icons/pda_icons/pda_bucket.png',
+		"medbot"		= 'icons/pda_icons/pda_medbot.png',
+		"floorbot"		= 'icons/pda_icons/pda_floorbot.png',
+		"cleanbot"		= 'icons/pda_icons/pda_cleanbot.png',
+		"crate"			= 'icons/pda_icons/pda_crate.png',
+		"cuffs"			= 'icons/pda_icons/pda_cuffs.png',
+		"eject"			= 'icons/pda_icons/pda_eject.png',
+		"flashlight"	= 'icons/pda_icons/pda_flashlight.png',
+		"honk"			= 'icons/pda_icons/pda_honk.png',
+		"mail"			= 'icons/pda_icons/pda_mail.png',
+		"medical"		= 'icons/pda_icons/pda_medical.png',
+		"menu"			= 'icons/pda_icons/pda_menu.png',
+		"mule"			= 'icons/pda_icons/pda_mule.png',
+		"notes"			= 'icons/pda_icons/pda_notes.png',
+		"power"			= 'icons/pda_icons/pda_power.png',
+		"rdoor"			= 'icons/pda_icons/pda_rdoor.png',
+		"reagent"		= 'icons/pda_icons/pda_reagent.png',
+		"refresh"		= 'icons/pda_icons/pda_refresh.png',
+		"scanner"		= 'icons/pda_icons/pda_scanner.png',
+		"signaler"		= 'icons/pda_icons/pda_signaler.png',
+		"status"		= 'icons/pda_icons/pda_status.png',
+		"dronephone"	= 'icons/pda_icons/pda_dronephone.png',
+		"emoji"			= 'icons/pda_icons/pda_emoji.png'
+	)
+
+/datum/asset/spritesheet/simple/paper
+	name = "paper"
+	assets = list(
+		"stamp-clown" = 'icons/stamp_icons/large_stamp-clown.png',
+		"stamp-deny" = 'icons/stamp_icons/large_stamp-deny.png',
+		"stamp-ok" = 'icons/stamp_icons/large_stamp-ok.png',
+		"stamp-hop" = 'icons/stamp_icons/large_stamp-hop.png',
+		"stamp-cmo" = 'icons/stamp_icons/large_stamp-cmo.png',
+		"stamp-ce" = 'icons/stamp_icons/large_stamp-ce.png',
+		"stamp-hos" = 'icons/stamp_icons/large_stamp-hos.png',
+		"stamp-rd" = 'icons/stamp_icons/large_stamp-rd.png',
+		"stamp-cap" = 'icons/stamp_icons/large_stamp-cap.png',
+		"stamp-qm" = 'icons/stamp_icons/large_stamp-qm.png',
+		"stamp-law" = 'icons/stamp_icons/large_stamp-law.png'
+	)
+
+
+/datum/asset/simple/IRV
+	assets = list(
+		"jquery-ui.custom-core-widgit-mouse-sortable-min.js" = 'html/IRV/jquery-ui.custom-core-widgit-mouse-sortable-min.js',
+	)
+
+/datum/asset/group/IRV
+	children = list(
+		/datum/asset/simple/jquery,
+		/datum/asset/simple/IRV
+	)
+
+/datum/asset/simple/changelog
+	assets = list(
+		"88x31.png" = 'html/88x31.png',
+		"bug-minus.png" = 'html/bug-minus.png',
+		"cross-circle.png" = 'html/cross-circle.png',
+		"hard-hat-exclamation.png" = 'html/hard-hat-exclamation.png',
+		"image-minus.png" = 'html/image-minus.png',
+		"image-plus.png" = 'html/image-plus.png',
+		"music-minus.png" = 'html/music-minus.png',
+		"music-plus.png" = 'html/music-plus.png',
+		"tick-circle.png" = 'html/tick-circle.png',
+		"wrench-screwdriver.png" = 'html/wrench-screwdriver.png',
+		"spell-check.png" = 'html/spell-check.png',
+		"burn-exclamation.png" = 'html/burn-exclamation.png',
+		"chevron.png" = 'html/chevron.png',
+		"chevron-expand.png" = 'html/chevron-expand.png',
+		"scales.png" = 'html/scales.png',
+		"coding.png" = 'html/coding.png',
+		"ban.png" = 'html/ban.png',
+		"chrome-wrench.png" = 'html/chrome-wrench.png',
+		"changelog.css" = 'html/changelog.css'
+	)
+
+/datum/asset/group/goonchat
+	children = list(
+		/datum/asset/simple/jquery,
+		/datum/asset/simple/goonchat,
+		/datum/asset/spritesheet/goonchat,
+		/datum/asset/simple/fontawesome
+	)
+
+/datum/asset/simple/jquery
+	verify = FALSE
+	assets = list(
+		"jquery.min.js"            = 'code/modules/goonchat/browserassets/js/jquery.min.js',
+	)
+
+/datum/asset/simple/goonchat
+	verify = FALSE
+	assets = list(
+		"json2.min.js"             = 'code/modules/goonchat/browserassets/js/json2.min.js',
+		"browserOutput.js"         = 'code/modules/goonchat/browserassets/js/browserOutput.js',
+		"browserOutput.css"	       = 'code/modules/goonchat/browserassets/css/browserOutput.css',
+		"browserOutput_white.css"  = 'code/modules/goonchat/browserassets/css/browserOutput_white.css',
+	)
+
+/datum/asset/simple/fontawesome
+	verify = FALSE
+	assets = list(
+		"fa-regular-400.eot"  = 'html/font-awesome/webfonts/fa-regular-400.eot',
+		"fa-regular-400.woff" = 'html/font-awesome/webfonts/fa-regular-400.woff',
+		"fa-solid-900.eot"    = 'html/font-awesome/webfonts/fa-solid-900.eot',
+		"fa-solid-900.woff"   = 'html/font-awesome/webfonts/fa-solid-900.woff',
+		"font-awesome.css"    = 'html/font-awesome/css/all.min.css',
+		"v4shim.css"          = 'html/font-awesome/css/v4-shims.min.css'
+	)
+
+/datum/asset/spritesheet/goonchat
+	name = "chat"
+
+/datum/asset/spritesheet/goonchat/register()
+	InsertAll("emoji", 'icons/emoji.dmi')
+
+	// pre-loading all lanugage icons also helps to avoid meta
+	InsertAll("language", 'icons/misc/language.dmi')
+	// catch languages which are pulling icons from another file
+	for(var/path in typesof(/datum/language))
+		var/datum/language/L = path
+		var/icon = initial(L.icon)
+		if (icon != 'icons/misc/language.dmi')
+			var/icon_state = initial(L.icon_state)
+			Insert("language-[icon_state]", icon, icon_state=icon_state)
+
+	..()
+
+/datum/asset/simple/permissions
+	assets = list(
+		"padlock.png"	= 'html/padlock.png'
+	)
+
+/datum/asset/simple/notes
+	assets = list(
+		"high_button.png" = 'html/high_button.png',
+		"medium_button.png" = 'html/medium_button.png',
+		"minor_button.png" = 'html/minor_button.png',
+		"none_button.png" = 'html/none_button.png',
+	)
+
+/datum/asset/simple/arcade
+	assets = list(
+		"boss1.gif" = 'icons/UI_Icons/Arcade/boss1.gif',
+		"boss2.gif" = 'icons/UI_Icons/Arcade/boss2.gif',
+		"boss3.gif" = 'icons/UI_Icons/Arcade/boss3.gif',
+		"boss4.gif" = 'icons/UI_Icons/Arcade/boss4.gif',
+		"boss5.gif" = 'icons/UI_Icons/Arcade/boss5.gif',
+		"boss6.gif" = 'icons/UI_Icons/Arcade/boss6.gif',
+		)
+
+/datum/asset/spritesheet/simple/achievements
+	name ="achievements"
+	assets = list(
+		"default" = 'icons/UI_Icons/Achievements/default.png',
+		"basemisc" = 'icons/UI_Icons/Achievements/basemisc.png',
+		"baseboss" = 'icons/UI_Icons/Achievements/baseboss.png',
+		"baseskill" = 'icons/UI_Icons/Achievements/baseskill.png',
+		"bbgum" = 'icons/UI_Icons/Achievements/Boss/bbgum.png',
+		"colossus" = 'icons/UI_Icons/Achievements/Boss/colossus.png',
+		"hierophant" = 'icons/UI_Icons/Achievements/Boss/hierophant.png',
+		"legion" = 'icons/UI_Icons/Achievements/Boss/legion.png',
+		"miner" = 'icons/UI_Icons/Achievements/Boss/miner.png',
+		"swarmer" = 'icons/UI_Icons/Achievements/Boss/swarmer.png',
+		"tendril" = 'icons/UI_Icons/Achievements/Boss/tendril.png',
+		"featofstrength" = 'icons/UI_Icons/Achievements/Misc/featofstrength.png',
+		"helbital" = 'icons/UI_Icons/Achievements/Misc/helbital.png',
+		"jackpot" = 'icons/UI_Icons/Achievements/Misc/jackpot.png',
+		"meteors" = 'icons/UI_Icons/Achievements/Misc/meteors.png',
+		"timewaste" = 'icons/UI_Icons/Achievements/Misc/timewaste.png',
+		"upgrade" = 'icons/UI_Icons/Achievements/Misc/upgrade.png',
+		"clownking" = 'icons/UI_Icons/Achievements/Misc/clownking.png',
+		"clownthanks" = 'icons/UI_Icons/Achievements/Misc/clownthanks.png',
+		"rule8" = 'icons/UI_Icons/Achievements/Misc/rule8.png',
+		"snail" = 'icons/UI_Icons/Achievements/Misc/snail.png',
+		"mining" = 'icons/UI_Icons/Achievements/Skills/mining.png',
+	)
+
+/datum/asset/spritesheet/simple/pills
+	name ="pills"
+	assets = list(
+		"pill1" = 'icons/UI_Icons/Pills/pill1.png',
+		"pill2" = 'icons/UI_Icons/Pills/pill2.png',
+		"pill3" = 'icons/UI_Icons/Pills/pill3.png',
+		"pill4" = 'icons/UI_Icons/Pills/pill4.png',
+		"pill5" = 'icons/UI_Icons/Pills/pill5.png',
+		"pill6" = 'icons/UI_Icons/Pills/pill6.png',
+		"pill7" = 'icons/UI_Icons/Pills/pill7.png',
+		"pill8" = 'icons/UI_Icons/Pills/pill8.png',
+		"pill9" = 'icons/UI_Icons/Pills/pill9.png',
+		"pill10" = 'icons/UI_Icons/Pills/pill10.png',
+		"pill11" = 'icons/UI_Icons/Pills/pill11.png',
+		"pill12" = 'icons/UI_Icons/Pills/pill12.png',
+		"pill13" = 'icons/UI_Icons/Pills/pill13.png',
+		"pill14" = 'icons/UI_Icons/Pills/pill14.png',
+		"pill15" = 'icons/UI_Icons/Pills/pill15.png',
+		"pill16" = 'icons/UI_Icons/Pills/pill16.png',
+		"pill17" = 'icons/UI_Icons/Pills/pill17.png',
+		"pill18" = 'icons/UI_Icons/Pills/pill18.png',
+		"pill19" = 'icons/UI_Icons/Pills/pill19.png',
+		"pill20" = 'icons/UI_Icons/Pills/pill20.png',
+		"pill21" = 'icons/UI_Icons/Pills/pill21.png',
+		"pill22" = 'icons/UI_Icons/Pills/pill22.png',
+	)
+
+//this exists purely to avoid meta by pre-loading all language icons.
+/datum/asset/language/register()
+	for(var/path in typesof(/datum/language))
+		set waitfor = FALSE
+		var/datum/language/L = new path ()
+		L.get_icon()
+
+/datum/asset/spritesheet/pipes
+	name = "pipes"
+
+/datum/asset/spritesheet/pipes/register()
+	for (var/each in list('icons/obj/atmospherics/pipes/pipe_item.dmi', 'icons/obj/atmospherics/pipes/disposal.dmi', 'icons/obj/atmospherics/pipes/transit_tube.dmi', 'icons/obj/plumbing/fluid_ducts.dmi'))
+		InsertAll("", each, GLOB.alldirs)
+	..()
+
+// Representative icons for each research design
+/datum/asset/spritesheet/research_designs
+	name = "design"
+
+/datum/asset/spritesheet/research_designs/register()
+	for (var/path in subtypesof(/datum/design))
+		var/datum/design/D = path
+
+		var/icon_file
+		var/icon_state
+		var/icon/I
+
+		if(initial(D.research_icon) && initial(D.research_icon_state)) //If the design has an icon replacement skip the rest
+			icon_file = initial(D.research_icon)
+			icon_state = initial(D.research_icon_state)
+			if(!(icon_state in icon_states(icon_file)))
+				warning("design [D] with icon '[icon_file]' missing state '[icon_state]'")
+				continue
+			I = icon(icon_file, icon_state, SOUTH)
+
+		else
+			// construct the icon and slap it into the resource cache
+			var/atom/item = initial(D.build_path)
+			if (!ispath(item, /atom))
+				// biogenerator outputs to beakers by default
+				if (initial(D.build_type) & BIOGENERATOR)
+					item = /obj/item/reagent_containers/glass/beaker/large
+				else
+					continue  // shouldn't happen, but just in case
+
+			// circuit boards become their resulting machines or computers
+			if (ispath(item, /obj/item/circuitboard))
+				var/obj/item/circuitboard/C = item
+				var/machine = initial(C.build_path)
+				if (machine)
+					item = machine
+
+			icon_file = initial(item.icon)
+			icon_state = initial(item.icon_state)
+
+			if(!(icon_state in icon_states(icon_file)))
+				warning("design [D] with icon '[icon_file]' missing state '[icon_state]'")
+				continue
+			I = icon(icon_file, icon_state, SOUTH)
+
+			// computers (and snowflakes) get their screen and keyboard sprites
+			if (ispath(item, /obj/machinery/computer) || ispath(item, /obj/machinery/power/solar_control))
+				var/obj/machinery/computer/C = item
+				var/screen = initial(C.icon_screen)
+				var/keyboard = initial(C.icon_keyboard)
+				var/all_states = icon_states(icon_file)
+				if (screen && (screen in all_states))
+					I.Blend(icon(icon_file, screen, SOUTH), ICON_OVERLAY)
+				if (keyboard && (keyboard in all_states))
+					I.Blend(icon(icon_file, keyboard, SOUTH), ICON_OVERLAY)
+
+		Insert(initial(D.id), I)
+	return ..()
+
+/datum/asset/spritesheet/vending
+	name = "vending"
+
+/datum/asset/spritesheet/vending/register()
+	for (var/k in GLOB.vending_products)
+		var/atom/item = k
+		if (!ispath(item, /atom))
+			continue
+
+		var/icon_file = initial(item.icon)
+		var/icon_state = initial(item.icon_state)
+		var/icon/I
+
+		var/icon_states_list = icon_states(icon_file)
+		if(icon_state in icon_states_list)
+			I = icon(icon_file, icon_state, SOUTH)
+			var/c = initial(item.color)
+			if (!isnull(c) && c != "#FFFFFF")
+				I.Blend(c, ICON_MULTIPLY)
+		else
+			var/icon_states_string
+			for (var/an_icon_state in icon_states_list)
+				if (!icon_states_string)
+					icon_states_string = "[json_encode(an_icon_state)](\ref[an_icon_state])"
+				else
+					icon_states_string += ", [json_encode(an_icon_state)](\ref[an_icon_state])"
+			stack_trace("[item] does not have a valid icon state, icon=[icon_file], icon_state=[json_encode(icon_state)](\ref[icon_state]), icon_states=[icon_states_string]")
+			I = icon('icons/turf/floors.dmi', "", SOUTH)
+
+		var/imgid = replacetext(replacetext("[item]", "/obj/item/", ""), "/", "-")
+
+		Insert(imgid, I)
+	return ..()
+
+/datum/asset/simple/genetics
+	assets = list(
+		"dna_discovered.gif"	= 'html/dna_discovered.gif',
+		"dna_undiscovered.gif"	= 'html/dna_undiscovered.gif',
+		"dna_extra.gif" 		= 'html/dna_extra.gif'
+	)

code/modules/client/client_procs.dm

@@ -37,28 +37,11 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 		return
 
 	// asset_cache
+	var/asset_cache_job
 	if(href_list["asset_cache_confirm_arrival"])
-		var/job = text2num(href_list["asset_cache_confirm_arrival"])
-		//because we skip the limiter, we have to make sure this is a valid arrival and not somebody tricking us
-		//	into letting append to a list without limit.
-		if (job && job <= last_asset_job && !(job in completed_asset_jobs))
-			completed_asset_jobs += job
+		asset_cache_job = asset_cache_confirm_arrival(href_list["asset_cache_confirm_arrival"])
+		if (!asset_cache_job)
 			return
-		else if (job in completed_asset_jobs) //byond bug ID:2256651
-			to_chat(src, "<span class='danger'>An error has been detected in how your client is receiving resources. Attempting to correct.... (If you keep seeing these messages you might want to close byond and reconnect)</span>")
-			src << browse("...", "window=asset_cache_browser")
-			// Keypress passthrough
-	if(href_list["__keydown"])
-		var/keycode = browser_keycode_to_byond(href_list["__keydown"])
-		if(keycode)
-			keyDown(keycode)
-		return
-	if(href_list["__keyup"])
-		var/keycode = browser_keycode_to_byond(href_list["__keyup"])
-		if(keycode)
-			keyUp(keycode)
-		return
-
 
 	var/mtl = CONFIG_GET(number/minute_topic_limit)
 	if (!holder && mtl)
@@ -75,7 +58,7 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 				topiclimiter[ADMINSWARNED_AT] = minute
 				msg += " Administrators have been informed."
 				log_game("[key_name(src)] Has hit the per-minute topic limit of [mtl] topic calls in a given game minute")
-				message_admins("[ADMIN_LOOKUPFLW(src)] [ADMIN_KICK(usr)] Has hit the per-minute topic limit of [mtl] topic calls in a given game minute")
+				message_admins("[ADMIN_LOOKUPFLW(usr)] [ADMIN_KICK(usr)] Has hit the per-minute topic limit of [mtl] topic calls in a given game minute")
 			to_chat(src, "<span class='danger'>[msg]</span>")
 			return
 
@@ -96,23 +79,37 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 	if(!(href_list["_src_"] == "chat" && href_list["proc"] == "ping" && LAZYLEN(href_list) == 2))
 		log_href("[src] (usr:[usr]\[[COORD(usr)]\]) : [hsrc ? "[hsrc] " : ""][href]")
 
+	//byond bug ID:2256651
+	if (asset_cache_job && (asset_cache_job in completed_asset_jobs))
+		to_chat(src, "<span class='danger'>An error has been detected in how your client is receiving resources. Attempting to correct.... (If you keep seeing these messages you might want to close byond and reconnect)</span>")
+		src << browse("...", "window=asset_cache_browser")
+		return
+	if (href_list["asset_cache_preload_data"])
+		asset_cache_preload_data(href_list["asset_cache_preload_data"])
+		return
+
+	// Keypress passthrough
+	if(href_list["__keydown"])
+		var/keycode = browser_keycode_to_byond(href_list["__keydown"])
+		if(keycode)
+			keyDown(keycode)
+		return
+	if(href_list["__keyup"])
+		var/keycode = browser_keycode_to_byond(href_list["__keyup"])
+		if(keycode)
+			keyUp(keycode)
+		return
+
 	// Admin PM
 	if(href_list["priv_msg"])
 		cmd_admin_pm(href_list["priv_msg"],null)
 		return
 
-	// CITADEL Start - Mentor PM
-	if (citadel_client_procs(href_list))
-		return
-	// CITADEL End
-
 	switch(href_list["_src_"])
 		if("holder")
 			hsrc = holder
 		if("usr")
 			hsrc = mob
-		if("mentor") // CITADEL
-			hsrc = mentor_datum // CITADEL END
 		if("prefs")
 			if (inprefs)
 				return
@@ -140,7 +137,6 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 		to_chat(src, "Become a BYOND member to access member-perks and features, as well as support the engine that makes this game possible. Only 10 bucks for 3 months! <a href=\"https://secure.byond.com/membership\">Click Here to find out more</a>.")
 		return 0
 	return 1
-
 /*
  * Call back proc that should be checked in all paths where a client can send messages
  *
@@ -259,13 +255,11 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 			new /datum/admins(localhost_rank, ckey, 1, 1)
 	//preferences datum - also holds some persistent data for the client (because we may as well keep these datums to a minimum)
 	prefs = GLOB.preferences_datums[ckey]
-
 	if(prefs)
 		prefs.parent = src
 	else
 		prefs = new /datum/preferences(src)
 		GLOB.preferences_datums[ckey] = prefs
-
 	prefs.last_ip = address				//these are gonna be used for banning
 	prefs.last_id = computer_id			//these are gonna be used for banning
 	fps = prefs.clientfps
@@ -303,12 +297,16 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 		player_details = GLOB.player_details[ckey]
 		player_details.byond_version = full_version
 	else
-		player_details = new
+		player_details = new(ckey)
 		player_details.byond_version = full_version
 		GLOB.player_details[ckey] = player_details
 
 
 	. = ..()	//calls mob.Login()
+	if (length(GLOB.stickybanadminexemptions))
+		GLOB.stickybanadminexemptions -= ckey
+		if (!length(GLOB.stickybanadminexemptions))
+			restore_stickybans()
 
 	if (byond_version >= 512)
 		if (!byond_build || byond_build < 1386)
@@ -330,6 +328,7 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 
 	if(SSinput.initialized)
 		set_macros()
+		update_movement_keys()
 
 	chatOutput.start() // Starts the chat
 
@@ -342,12 +341,13 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 	connection_timeofday = world.timeofday
 	winset(src, null, "command=\".configure graphics-hwmode on\"")
 	var/cev = CONFIG_GET(number/client_error_version)
+	var/ceb = CONFIG_GET(number/client_error_build)
 	var/cwv = CONFIG_GET(number/client_warn_version)
-	if (byond_version < cev)		//Out of date client.
+	if (byond_version < cev || (byond_version == cev && byond_build < ceb))		//Out of date client.
 		to_chat(src, "<span class='danger'><b>Your version of BYOND is too old:</b></span>")
 		to_chat(src, CONFIG_GET(string/client_error_message))
-		to_chat(src, "Your version: [byond_version]")
-		to_chat(src, "Required version: [cev] or later")
+		to_chat(src, "Your version: [byond_version].[byond_build]")
+		to_chat(src, "Required version: [cev].[ceb] or later")
 		to_chat(src, "Visit <a href=\"https://secure.byond.com/download\">BYOND's website</a> to get the latest version of BYOND.")
 		if (connecting_admin)
 			to_chat(src, "Because you are an admin, you are being allowed to walk past this limitation, But it is still STRONGLY suggested you upgrade")
@@ -397,7 +397,7 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 		if (nnpa >= 0)
 			message_admins("New user: [key_name_admin(src)] is connecting here for the first time.")
 			if (CONFIG_GET(flag/irc_first_connection_alert))
-				send2irc_adminless_only("New-user", "[key_name(src)] is connecting for the first time!")
+				send2tgs_adminless_only("New-user", "[key_name(src)] is connecting for the first time!")
 	else if (isnum(cached_player_age) && cached_player_age < nnpa)
 		message_admins("New user: [key_name_admin(src)] just connected with an age of [cached_player_age] day[(player_age==1?"":"s")]")
 	if(CONFIG_GET(flag/use_account_age_for_jobs) && account_age >= 0)
@@ -405,7 +405,7 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 	if(account_age >= 0 && account_age < nnpa)
 		message_admins("[key_name_admin(src)] (IP: [address], ID: [computer_id]) is a new BYOND account [account_age] day[(account_age==1?"":"s")] old, created on [account_join_date].")
 		if (CONFIG_GET(flag/irc_first_connection_alert))
-			send2irc_adminless_only("new_byond_user", "[key_name(src)] (IP: [address], ID: [computer_id]) is a new BYOND account [account_age] day[(account_age==1?"":"s")] old, created on [account_join_date].")
+			send2tgs_adminless_only("new_byond_user", "[key_name(src)] (IP: [address], ID: [computer_id]) is a new BYOND account [account_age] day[(account_age==1?"":"s")] old, created on [account_join_date].")
 	get_message_output("watchlist entry", ckey)
 	check_ip_intel()
 	validate_key_in_db()
@@ -466,9 +466,17 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 //////////////
 
 /client/Del()
+	if(!gc_destroyed)
+		Destroy() //Clean up signals and timers.
+	return ..()
+
+/client/Destroy()
+	GLOB.clients -= src
+	GLOB.directory -= ckey
+	log_access("Logout: [key_name(src)]")
+	GLOB.ahelp_tickets.ClientLogout(src)
 	if(credits)
 		QDEL_LIST(credits)
-	log_access("Logout: [key_name(src)]")
 	if(holder)
 		adminGreet(1)
 		holder.owner = null
@@ -489,19 +497,13 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 				"Forever alone :("\
 			)
 
-			send2irc("Server", "[cheesy_message] (No admins online)")
-
-	GLOB.ahelp_tickets.ClientLogout(src)
-	GLOB.directory -= ckey
-	GLOB.clients -= src
+			send2tgs("Server", "[cheesy_message] (No admins online)")
 	QDEL_LIST_ASSOC_VAL(char_render_holders)
 	if(movingmob != null)
 		movingmob.client_mobs_in_contents -= mob
 		UNSETEMPTY(movingmob.client_mobs_in_contents)
 	Master.UpdateTickRate()
-	return ..()
-
-/client/Destroy()
+	. = ..() //Even though we're going to be hard deleted there are still some things that want to know the destroy is happening
 	return QDEL_HINT_HARDDEL_NOW
 
 /client/proc/set_client_age_from_db(connectiontopic)
@@ -511,7 +513,9 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 		return
 	var/sql_ckey = sanitizeSQL(src.ckey)
 	var/datum/DBQuery/query_get_related_ip = SSdbcore.NewQuery("SELECT ckey FROM [format_table_name("player")] WHERE ip = INET_ATON('[address]') AND ckey != '[sql_ckey]'")
-	query_get_related_ip.Execute()
+	if(!query_get_related_ip.Execute())
+		qdel(query_get_related_ip)
+		return
 	related_accounts_ip = ""
 	while(query_get_related_ip.NextRow())
 		related_accounts_ip += "[query_get_related_ip.item[1]], "
@@ -539,10 +543,10 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 		qdel(query_client_in_db)
 		return
 	if(!query_client_in_db.NextRow())
-		if (CONFIG_GET(flag/panic_bunker) && !holder && !GLOB.deadmins[ckey] && !(ckey in GLOB.bunker_passthrough))
+		if (CONFIG_GET(flag/panic_bunker) && !holder && !GLOB.deadmins[ckey])
 			log_access("Failed Login: [key] - New account attempting to connect during panic bunker")
 			message_admins("<span class='adminnotice'>Failed Login: [key] - New account attempting to connect during panic bunker</span>")
-			to_chat(src, "<span class='notice'>You must first join the Discord to verify your account before joining this server.<br>To do so, read the rules and post a request in the #station-access-requests channel under the \"Main server\" category in the Discord server linked here: <a href='https://discord.gg/E6SQuhz'>https://discord.gg/E6SQuhz</a><br>If you have already done so, wait a few minutes then try again; sometimes the server needs to fully load before you can join.</span>") //CIT CHANGE - makes the panic bunker disconnect message point to the discord
+			to_chat(src, CONFIG_GET(string/panic_bunker_message))
 			var/list/connectiontopic_a = params2list(connectiontopic)
 			var/list/panic_addr = CONFIG_GET(string/panic_server_address)
 			if(panic_addr && !connectiontopic_a["redirect"])
@@ -566,8 +570,6 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 		if(!account_join_date)
 			account_join_date = "Error"
 			account_age = -1
-		else if(ckey in GLOB.bunker_passthrough)
-			GLOB.bunker_passthrough -= ckey
 	qdel(query_client_in_db)
 	var/datum/DBQuery/query_get_client_age = SSdbcore.NewQuery("SELECT firstseen, DATEDIFF(Now(),firstseen), accountjoindate, DATEDIFF(Now(),accountjoindate) FROM [format_table_name("player")] WHERE ckey = '[sql_ckey]'")
 	if(!query_get_client_age.Execute())
@@ -691,7 +693,7 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 
 			if (!cidcheck_failedckeys[ckey])
 				message_admins("<span class='adminnotice'>[key_name(src)] has been detected as using a cid randomizer. Connection rejected.</span>")
-				send2irc_adminless_only("CidRandomizer", "[key_name(src)] has been detected as using a cid randomizer. Connection rejected.")
+				send2tgs_adminless_only("CidRandomizer", "[key_name(src)] has been detected as using a cid randomizer. Connection rejected.")
 				cidcheck_failedckeys[ckey] = TRUE
 				note_randomizer_user()
 
@@ -702,7 +704,7 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 		else
 			if (cidcheck_failedckeys[ckey])
 				message_admins("<span class='adminnotice'>[key_name_admin(src)] has been allowed to connect after showing they removed their cid randomizer</span>")
-				send2irc_adminless_only("CidRandomizer", "[key_name(src)] has been allowed to connect after showing they removed their cid randomizer.")
+				send2tgs_adminless_only("CidRandomizer", "[key_name(src)] has been allowed to connect after showing they removed their cid randomizer.")
 				cidcheck_failedckeys -= ckey
 			if (cidcheck_spoofckeys[ckey])
 				message_admins("<span class='adminnotice'>[key_name_admin(src)] has been allowed to connect after appearing to have attempted to spoof a cid randomizer check because it <i>appears</i> they aren't spoofing one this time</span>")
@@ -736,7 +738,7 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 	var/sql_system_ckey = sanitizeSQL(system_ckey)
 	var/sql_ckey = sanitizeSQL(ckey)
 	//check to see if we noted them in the last day.
-	var/datum/DBQuery/query_get_notes = SSdbcore.NewQuery("SELECT id FROM [format_table_name("messages")] WHERE type = 'note' AND targetckey = '[sql_ckey]' AND adminckey = '[sql_system_ckey]' AND timestamp + INTERVAL 1 DAY < NOW() AND deleted = 0 AND expire_timestamp > NOW()")
+	var/datum/DBQuery/query_get_notes = SSdbcore.NewQuery("SELECT id FROM [format_table_name("messages")] WHERE type = 'note' AND targetckey = '[sql_ckey]' AND adminckey = '[sql_system_ckey]' AND timestamp + INTERVAL 1 DAY < NOW() AND deleted = 0 AND (expire_timestamp > NOW() OR expire_timestamp IS NULL)")
 	if(!query_get_notes.Execute())
 		qdel(query_get_notes)
 		return
@@ -745,7 +747,7 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 		return
 	qdel(query_get_notes)
 	//regardless of above, make sure their last note is not from us, as no point in repeating the same note over and over.
-	query_get_notes = SSdbcore.NewQuery("SELECT adminckey FROM [format_table_name("messages")] WHERE targetckey = '[sql_ckey]' AND deleted = 0 AND expire_timestamp > NOW() ORDER BY timestamp DESC LIMIT 1")
+	query_get_notes = SSdbcore.NewQuery("SELECT adminckey FROM [format_table_name("messages")] WHERE targetckey = '[sql_ckey]' AND deleted = 0 AND (expire_timestamp > NOW() OR expire_timestamp IS NULL) ORDER BY timestamp DESC LIMIT 1")
 	if(!query_get_notes.Execute())
 		qdel(query_get_notes)
 		return
@@ -765,13 +767,19 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 			message_admins("<span class='adminnotice'>Proxy Detection: [key_name_admin(src)] IP intel rated [res.intel*100]% likely to be a Proxy/VPN.</span>")
 		ip_intel = res.intel
 
-/client/Click(atom/object, atom/location, control, params, ignore_spam = FALSE)
+/client/Click(atom/object, atom/location, control, params)
 	var/ab = FALSE
 	var/list/L = params2list(params)
+
+	var/dragged = L["drag"]
+	if(dragged && !L[dragged])
+		return
+
 	if (object && object == middragatom && L["left"])
 		ab = max(0, 5 SECONDS-(world.time-middragtime)*0.1)
+
 	var/mcl = CONFIG_GET(number/minute_click_limit)
-	if (!holder && !ignore_spam && mcl)
+	if (!holder && mcl)
 		var/minute = round(world.time, 600)
 		if (!clicklimiter)
 			clicklimiter = new(LIMITER_SIZE)
@@ -787,16 +795,15 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 				msg += " Administrators have been informed."
 				if (ab)
 					log_game("[key_name(src)] is using the middle click aimbot exploit")
-					message_admins("[ADMIN_LOOKUPFLW(src)] [ADMIN_KICK(usr)] is using the middle click aimbot exploit</span>")
+					message_admins("[ADMIN_LOOKUPFLW(usr)] [ADMIN_KICK(usr)] is using the middle click aimbot exploit</span>")
 					add_system_note("aimbot", "Is using the middle click aimbot exploit")
-
 				log_game("[key_name(src)] Has hit the per-minute click limit of [mcl] clicks in a given game minute")
-				message_admins("[ADMIN_LOOKUPFLW(src)] [ADMIN_KICK(usr)] Has hit the per-minute click limit of [mcl] clicks in a given game minute")
+				message_admins("[ADMIN_LOOKUPFLW(usr)] [ADMIN_KICK(usr)] Has hit the per-minute click limit of [mcl] clicks in a given game minute")
 			to_chat(src, "<span class='danger'>[msg]</span>")
 			return
 
 	var/scl = CONFIG_GET(number/second_click_limit)
-	if (!holder && !ignore_spam && scl)
+	if (!holder && scl)
 		var/second = round(world.time, 10)
 		if (!clicklimiter)
 			clicklimiter = new(LIMITER_SIZE)
@@ -808,15 +815,15 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 			to_chat(src, "<span class='danger'>Your previous click was ignored because you've done too many in a second</span>")
 			return
 
-	if(ab) //Citadel edit, things with stuff.
-		return
-
 	if (prefs.hotkeys)
 		// If hotkey mode is enabled, then clicking the map will automatically
 		// unfocus the text bar. This removes the red color from the text bar
 		// so that the visual focus indicator matches reality.
 		winset(src, null, "input.background-color=[COLOR_INPUT_DISABLED]")
 
+	else
+		winset(src, null, "input.focus=true input.background-color=[COLOR_INPUT_ENABLED]")
+
 	..()
 
 /client/proc/add_verbs_from_config()
@@ -852,17 +859,18 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 		'html/browser/playeroptions.css',
 		)
 	spawn (10) //removing this spawn causes all clients to not get verbs.
+		
+		//load info on what assets the client has
+		src << browse('code/modules/asset_cache/validate_assets.html', "window=asset_cache_browser")
+
 		//Precache the client with all other assets slowly, so as to not block other browse() calls
-		getFilesSlow(src, SSassets.preload, register_asset = FALSE)
+		addtimer(CALLBACK(GLOBAL_PROC, /proc/getFilesSlow, src, SSassets.preload, FALSE), 5 SECONDS)
+
 		#if (PRELOAD_RSC == 0)
 		for (var/name in GLOB.vox_sounds)
 			var/file = GLOB.vox_sounds[name]
 			Export("##action=load_rsc", file)
 			stoplag()
-		for (var/name in GLOB.vox_sounds_male)
-			var/file = GLOB.vox_sounds_male[name]
-			Export("##action=load_rsc", file)
-			stoplag()
 		#endif
 
 
@@ -888,19 +896,33 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 	var/viewscale = getviewsize(view)
 	var/x = viewscale[1]
 	var/y = viewscale[2]
-	x = CLAMP(x+change, min, max)
-	y = CLAMP(y+change, min,max)
+	x = clamp(x+change, min, max)
+	y = clamp(y+change, min,max)
 	change_view("[x]x[y]")
 
+/client/proc/update_movement_keys(datum/preferences/direct_prefs)
+	var/datum/preferences/D = prefs || direct_prefs
+	if(!D?.key_bindings)
+		return
+	movement_keys = list()
+	for(var/key in D.key_bindings)
+		for(var/kb_name in D.key_bindings[key])
+			switch(kb_name)
+				if("North")
+					movement_keys[key] = NORTH
+				if("East")
+					movement_keys[key] = EAST
+				if("West")
+					movement_keys[key] = WEST
+				if("South")
+					movement_keys[key] = SOUTH
+
 /client/proc/change_view(new_size)
 	if (isnull(new_size))
 		CRASH("change_view called without argument.")
 
-//CIT CHANGES START HERE - makes change_view change DEFAULT_VIEW to 15x15 depending on preferences
-	if(prefs && CONFIG_GET(string/default_view))
-		if(!prefs.widescreenpref && new_size == CONFIG_GET(string/default_view))
-			new_size = "15x15"
-//END OF CIT CHANGES
+	if(prefs && !prefs.widescreenpref && new_size == CONFIG_GET(string/default_view))
+		new_size = CONFIG_GET(string/default_view_square)
 
 	view = new_size
 	apply_clickcatcher()
@@ -909,7 +931,7 @@ GLOBAL_LIST_EMPTY(external_rsc_urls)
 		var/mob/living/M = mob
 		M.update_damage_hud()
 	if (prefs.auto_fit_viewport)
-		fit_viewport()
+		addtimer(CALLBACK(src,.verb/fit_viewport,10)) //Delayed to avoid wingets from Login calls.
 
 /client/proc/generate_clickcatcher()
 	if(!void)