refactor: Allow using access helpers for airlock spawners. (#26141)

* Allow access helpers for airlock spawners.

* whoops

* whitespace

* add visual access helper placement indicator

code/modules/mapping/access_helpers.dm

@@ -1,10 +1,13 @@
 /obj/effect/mapping_helpers/airlock/access
-	layer = DOOR_HELPER_LAYER
+	layer = SPLASHSCREEN_PLANE + 0.1 // Above even airlock spawners
 	icon_state = "access_helper"
 	var/access
 
 // These are mutually exclusive; can't have req_any and req_all
 /obj/effect/mapping_helpers/airlock/access/any/payload(obj/machinery/door/airlock/airlock)
+	if(is_type_in_list(airlock, blacklist))
+		return
+
 	if(airlock.req_access_txt == "0")
 		// Overwrite if there is no access set, otherwise add onto existing access
 		if(airlock.req_one_access_txt == "0")
@@ -15,6 +18,9 @@
 		log_world("[src] at [AREACOORD(src)] tried to set req_one_access, but req_access was already set!")
 
 /obj/effect/mapping_helpers/airlock/access/all/payload(obj/machinery/door/airlock/airlock)
+	if(is_type_in_list(airlock, blacklist))
+		return
+
 	if(airlock.req_one_access_txt == "0")
 		if(airlock.req_access_txt == "0")
 			airlock.req_access_txt = "[access]"

code/modules/mapping/mapping_helpers.dm

@@ -84,18 +84,20 @@
 
 /obj/effect/mapping_helpers/airlock/Initialize(mapload)
 	. = ..()
+
 	if(!mapload)
 		log_world("[src] spawned outside of mapload!")
-		return
+		return INITIALIZE_HINT_QDEL
 
+/obj/effect/mapping_helpers/airlock/LateInitialize()
+	. = ..()
 	if(!(locate(/obj/machinery/door) in get_turf(src)))
 		log_world("[src] failed to find an airlock at [AREACOORD(src)]")
 
 	for(var/obj/machinery/door/D in get_turf(src))
-		if(!is_type_in_list(D, blacklist))
-			payload(D)
+		payload(D)
 
-	return INITIALIZE_HINT_QDEL
+	qdel(src)
 
 /obj/effect/mapping_helpers/airlock/proc/payload(obj/machinery/door/airlock/payload)
 	return