Hard upstream sync (#6951)

* maps - none of our changes included yet i'll get them in after i finish up the rest of the sync

* sync part 1 - underscore folders in code

* controllers folder

* datums folder

* game folder

* cmon, work

* modules - admin to awaymissions

* cargo to events

* fields to lighting

* mapping > ruins

* rest of the code folder

* rest of the folders in the root directory

* DME

* fixes compiling errors. it compiles so it works

* readds map changes

* fixes dogborg module select

* fixes typo in moduleselect_alternate_icon filepath

code/game/objects/effects/decals/cleanable.dm

@@ -9,7 +9,7 @@
 
 /obj/effect/decal/cleanable/Initialize(mapload, list/datum/disease/diseases)
 	. = ..()
-	if (random_icon_states && length(random_icon_states) > 0)
+	if (random_icon_states && (icon_state == initial(icon_state)) && length(random_icon_states) > 0)
 		icon_state = pick(random_icon_states)
 	create_reagents(300)
 	if(loc && isturf(loc))