Port TG updating appearances (#17943)

* Get pants that match or else you gonna look silly yo

* Posters

* Fix other hud elements

* Rereviewed

* Update shotglass.dm

* Fix for new merged PRs

* Typo

* Coming across other stuff

* Update theblob.dm

* No takebacksies

* smh i forget to leave a comment

* Updated for the detgun and cards

* Should have rerun langserver again

* No longer plastic, more in scope

* Damn you bluespace

* Reverting turret logic, out of scope at this point

* Tweak that part

* Went over energy guns again, and fixed UI White's sprite sheet

* Welding masks, glasses, and JUSTICE

* Update portable_atmospherics.dm

* Cleaning up, clearing things up

* Review and suggestions

* Update valve.dm

* More tweaks

* Missing character

* Not distinct lightmasks, so they can be overlays

* Update generator.dm

* Add parameter so holodeck doesn't try to make a perfect copy

* Update unsorted.dm

* Spiders

* Better fix for spiders, fix vamps too

* Ghosts

* Update telekinesis.dm

* Cleaning up old procs

* It's set up to not copy datums... Unless they're in a list

* Donuts, duct tape, and detgun. D3VR coming to Early Access

* Update procs that interact with doors so they call update_state instead

* Forgot one spot, and actually might as well just force lock

* Cleaning up other things... Sigh, and kitty ears

* oops

* Getting used to how it works

* blinds

* Going back to the suit obscuring thing, so it doesn't update all the time

* Missed that from merging master

* I made this PR and forgot about it

* Fix runtimes in cards

* Make things a bit more unified

* Update update_icons.dm

* yarn, really?

* Update library_equipment.dm

* Update shieldgen.dm

* Every time Charlie merges something, I go back and see if I can improve things further

* what's this? more?

* Update misc_special.dm

* wow, paper

* Review

* More reviews

* To be sure, seems like being broken messed something sometimes

* Brought airlocks closer to how TG works to iron out some stuff

* Pizza and morgue

* Doesn't seem to hurt, tried with holodeck

* Revert "Doesn't seem to hurt, tried with holodeck"

This reverts commit 158529302b.

* Icon conflict

* Fix organ damage

* Don't ask how. Why. It's like that on prod too.

* Cutting down on things and updating from TG.

* More flexible. Just in case the thing you stuck it on didn't destroy.

* Hydro was one the things I touched earlier on, better rework it

* Reviews

* Cleaning up further, also bri'ish

* Undo a change I did, and switch over to a more recent implementation

* Update biogenerator.dm

* Rolling back to old airlocks, but with new duct taped note

* Functionally the same. I'd just rather not have the smoothing happen there

* Went over APCs again

* Fix welding helmet names in species files

* Update airlock.dm

* Update persistent_overlay.dm

* Oh, topic

code/game/objects/effects/decals/Cleanable/aliens.dm

@@ -19,6 +19,7 @@
 
 /obj/effect/decal/cleanable/blood/gibs/xeno/update_icon()
 	color = "#FFFFFF"
+	. = ..()
 
 /obj/effect/decal/cleanable/blood/gibs/xeno/up
 	random_icon_states = list("xgib1", "xgib2", "xgib3", "xgib4", "xgib5", "xgib6", "xgibup1", "xgibup1", "xgibup1")

code/game/objects/effects/decals/Cleanable/humans.dm

@@ -50,6 +50,7 @@ GLOBAL_LIST_EMPTY(splatter_cache)
 	if(basecolor == "rainbow")
 		basecolor = "#[pick(list("FF0000","FF7F00","FFFF00","00FF00","0000FF","4B0082","8F00FF"))]"
 	color = basecolor
+	..()
 
 /obj/effect/decal/cleanable/blood/proc/dry()
 	name = dryname
@@ -142,21 +143,26 @@ GLOBAL_LIST_EMPTY(splatter_cache)
 	random_icon_states = list("gib1", "gib2", "gib3", "gib4", "gib5", "gib6")
 	no_clear = TRUE
 	mergeable_decal = FALSE
-
+	var/image/giblets
 	var/fleshcolor = "#FFFFFF"
 
+/obj/effect/decal/cleanable/blood/gibs/Destroy()
+	giblets = null
+	return ..()
+
 /obj/effect/decal/cleanable/blood/gibs/update_icon()
-	var/image/giblets = new(base_icon, "[icon_state]_flesh", dir)
+	giblets = new(base_icon, "[icon_state]_flesh", dir)
 	if(!fleshcolor || fleshcolor == "rainbow")
 		fleshcolor = "#[pick(list("FF0000","FF7F00","FFFF00","00FF00","0000FF","4B0082","8F00FF"))]"
 	giblets.color = fleshcolor
 	var/icon/blood = new(base_icon,"[icon_state]",dir)
-
 	icon = blood
-	overlays.Cut()
-	overlays += giblets
 	. = ..()
 
+/obj/effect/decal/cleanable/blood/gibs/update_overlays()
+	. = ..()
+	. += giblets
+
 /obj/effect/decal/cleanable/blood/gibs/ex_act(severity)
 	return
 

code/game/objects/effects/decals/Cleanable/robots.dm

@@ -13,6 +13,7 @@
 
 /obj/effect/decal/cleanable/blood/gibs/robot/update_icon()
 	color = "#FFFFFF"
+	. = ..()
 
 /obj/effect/decal/cleanable/blood/gibs/robot/dry()	//pieces of robots do not dry up like
 	return

code/game/objects/effects/decals/Cleanable/tracks.dm

@@ -87,8 +87,8 @@ GLOBAL_LIST_EMPTY(fluidtrack_cache)
 				update_icon()
 
 
-/obj/effect/decal/cleanable/blood/footprints/update_icon()
-	overlays.Cut()
+/obj/effect/decal/cleanable/blood/footprints/update_overlays()
+	. = ..()
 
 	for(var/Ddir in GLOB.cardinal)
 		if(entered_dirs & Ddir)
@@ -100,7 +100,7 @@ GLOBAL_LIST_EMPTY(fluidtrack_cache)
 				GLOB.fluidtrack_cache["entered-[blood_state]-[Ddir]"] = I
 			if(I)
 				I.color = basecolor
-				overlays += I
+				. += I
 		if(exited_dirs & Ddir)
 			var/image/I
 			if(GLOB.fluidtrack_cache["exited-[blood_state]-[Ddir]"])
@@ -110,7 +110,7 @@ GLOBAL_LIST_EMPTY(fluidtrack_cache)
 				GLOB.fluidtrack_cache["exited-[blood_state]-[Ddir]"] = I
 			if(I)
 				I.color = basecolor
-				overlays += I
+				. += I
 
 	alpha = base_alpha + bloodiness