Merge pull request #6459 from Citadel-Station-13/upstream-merge-37281

[MIRROR] Removes old decal system

code/game/turfs/ChangeTurf.dm

@@ -25,8 +25,6 @@ GLOBAL_LIST_INIT(blacklisted_automated_baseturfs, typecacheof(list(
 			O = new()
 			O.underlays.Add(T)
 		T.ChangeTurf(type)
-		for(var/group in decals)
-			T.add_decal(decals[group],group)
 		if(underlays.len)
 			T.underlays = O.underlays
 	if(T.icon_state != icon_state)

code/game/turfs/turf.dm

@@ -26,7 +26,6 @@
 	var/explosion_level = 0	//for preventing explosion dodging
 	var/explosion_id = 0
 
-	var/list/decals
 	var/requires_activation	//add to air processing after initialize?
 	var/changing_turf = FALSE
 
@@ -413,18 +412,6 @@
 		playsound(src, "bodyfall", 50, 1)
 	faller.drop_all_held_items()
 
-/turf/proc/add_decal(decal,group)
-	LAZYINITLIST(decals)
-	if(!decals[group])
-		decals[group] = list()
-	decals[group] += decal
-	add_overlay(decals[group])
-
-/turf/proc/remove_decal(group)
-	LAZYINITLIST(decals)
-	cut_overlay(decals[group])
-	decals[group] = null
-
 /turf/proc/photograph(limit=20)
 	var/image/I = new()
 	I.add_overlay(src)