RPG Loot: Revisited & READY (#82533)

## About The Pull Request
Revival of #72881

A new alt click window with a tarkov-y loading spinner. Replaces the
object item window in stat panel.

## Videos
<details>
<summary>vids</summary>

toggleable grouping:

![syAA5zf6RK](https://github.com/tgstation/tgstation/assets/42397676/c89b372d-29f6-4ebe-895d-f73bbdc41c19)

now lists the floor as first obj:

![abc](https://github.com/tgstation/tgstation/assets/42397676/cd8dc962-2ac7-41bf-a5d3-b9e926116b06)

in action:

![dreamseeker_IkrPKt2QZt](https://github.com/tgstation/tgstation/assets/42397676/1f990aa0-60f0-47e7-9d93-b63e35d05273)

</details>

## features:
- search by name
- 515 image generator is much faster than alt click menu
- opening a gargantuan amount of items shouldnt freeze your screen
- groups similar items together in stacks by default, toggleable
- shows tile as first item
- <kbd>Shift</kbd> and <kbd>Ctrl</kbd> compatible with LMB
🖱️
- RMB points points at items (sry i could not get MMB working)
- key <kbd>Esc</kbd> to exit the window.


For devs:
- A new image generation tech.
- An error refetch mechanic to the Image component
- It does not "smart track" the items being added to the pile, just
reopen or refresh. This was a design decision.

## Why It's Good For The Game
Honestly I just dislike the stat panel

Fixes #53824

Fixes 

![image](https://github.com/tgstation/tgstation/assets/42397676/0e50faab-7d4d-4bf7-8c5b-4ac28547bfbd)

## Changelog
🆑
add: Added a loot window for alt-clicking tiles.
del: Removed the item browser from the stat panel.
/🆑

---------

Co-authored-by: Zephyr <12817816+ZephyrTFA@users.noreply.github.com>
Co-authored-by: AnturK <AnturK@users.noreply.github.com>
Co-authored-by: LemonInTheDark <58055496+LemonInTheDark@users.noreply.github.com>

code/modules/asset_cache/assets/icon_ref_map.dm

@@ -0,0 +1,28 @@
+/// Maps icon names to ref values
+/datum/asset/json/icon_ref_map
+	name = "icon_ref_map"
+	early = TRUE
+
+/datum/asset/json/icon_ref_map/generate()
+	var/list/data = list() //"icons/obj/drinks.dmi" => "[0xc000020]"
+
+	//var/start = "0xc000000"
+	var/value = 0
+
+	while(TRUE)
+		value += 1
+		var/ref = "\[0xc[num2text(value,6,16)]\]"
+		var/mystery_meat = locate(ref)
+
+		if(isicon(mystery_meat))
+			if(!isfile(mystery_meat)) // Ignore the runtime icons for now
+				continue
+			var/path = get_icon_dmi_path(mystery_meat) //Try to get the icon path
+			if(path)
+				data[path] = ref
+		else if(mystery_meat)
+			continue; //Some other non-icon resource, ogg/json/whatever
+		else //Out of resources end this, could also try to end this earlier as soon as runtime generated icons appear but eh
+			break;
+
+	return data

code/modules/asset_cache/transports/asset_transport.dm

@@ -82,11 +82,15 @@
 /// asset_list - A list of asset filenames to be sent to the client. Can optionally be assoicated with the asset's asset_cache_item datum.
 /// Returns TRUE if any assets were sent.
 /datum/asset_transport/proc/send_assets(client/client, list/asset_list)
+#if defined(UNIT_TESTS)
+	return
+#endif
+
 	if (!istype(client))
 		if (ismob(client))
-			var/mob/M = client
-			if (M.client)
-				client = M.client
+			var/mob/our_mob = client
+			if (our_mob.client)
+				client = our_mob.client
 			else //no stacktrace because this will mainly happen because the client went away
 				return
 		else