Merge pull request #10151 from Ghommie/Ghommie-cit450

refactors area code to allow for multiple areas to share the same APC, fire, air alarms etc.

code/game/objects/effects/effect_system/effects_foam.dm

@@ -126,7 +126,7 @@
 			T.PlaceOnTop(/turf/open/floor/plating/foam, flags = CHANGETURF_INHERIT_AIR)
 		for(var/direction in GLOB.cardinals)
 			var/turf/cardinal_turf = get_step(T, direction)
-			if(get_area(cardinal_turf) != get_area(T)) //We're at an area boundary, so let's block off this turf!
+			if(get_base_area(cardinal_turf) != get_area(T)) //We're at an area boundary, so let's block off this turf!
 				new/obj/structure/foamedmetal(T)
 				break
 	flick("[icon_state]-disolve", src)

code/game/objects/items/crayons.dm

@@ -427,7 +427,7 @@
 /obj/item/toy/crayon/proc/can_claim_for_gang(mob/user, atom/target)
 	// Check area validity.
 	// Reject space, player-created areas, and non-station z-levels.
-	var/area/A = get_area(target)
+	var/area/A = get_base_area(target)
 	if(!A || (!is_station_level(A.z)) || !A.valid_territory)
 		to_chat(user, "<span class='warning'>[A] is unsuitable for tagging.</span>")
 		return FALSE
@@ -461,7 +461,7 @@
 		qdel(old_marking)
 
 	var/datum/antagonist/gang/G = user.mind.has_antag_datum(/datum/antagonist/gang)
-	var/area/territory = get_area(target)
+	var/area/territory = get_base_area(target)
 
 	new /obj/effect/decal/cleanable/crayon/gang(target,G.gang,"graffiti",0,user) // Heres the gang tag.
 	to_chat(user, "<span class='notice'>You tagged [territory] for your gang!</span>")

code/game/objects/structures/ai_core.dm

@@ -52,7 +52,7 @@
 	var/area/A = get_area(src)
 	if(!A.blob_allowed)
 		return FALSE
-	if(!A.power_equip)
+	if(!A.powered(EQUIP))
 		return FALSE
 	if(!SSmapping.level_trait(T.z,ZTRAIT_STATION))
 		return FALSE

code/game/objects/structures/displaycase.dm

@@ -80,7 +80,7 @@
 /obj/structure/displaycase/proc/trigger_alarm()
 	//Activate Anti-theft
 	if(alert)
-		var/area/alarmed = get_area(src)
+		var/area/alarmed = get_base_area(src)
 		alarmed.burglaralert(src)
 		playsound(src, 'sound/effects/alert.ogg', 50, 1)