Areabound component & mapping helper (#51605)

* Adds areabound component and mapping helper.

* desc

* Delete multi-use one.

* doesn't really matter for this but sure

code/datums/components/areabound.dm

@@ -0,0 +1,25 @@
+/// Movables with this component will automatically return to their original turf if moved outside their initial area
+/datum/component/areabound
+	var/area/bound_area
+	var/turf/reset_turf
+	var/datum/movement_detector/move_tracker
+
+/datum/component/areabound/Initialize()
+	if(!ismovable(parent))
+		return COMPONENT_INCOMPATIBLE
+	bound_area = get_area(parent)
+	reset_turf = get_turf(parent)
+	move_tracker = new(parent,CALLBACK(src,.proc/check_bounds))
+
+/datum/component/areabound/proc/check_bounds()
+	var/atom/movable/AM = parent
+	var/area/current = get_area(AM)
+	if(current != bound_area)
+		if(!reset_turf || reset_turf.loc != bound_area)
+			stack_trace("Invalid areabound configuration") //qdel(src)
+			return
+		AM.forceMove(reset_turf)
+
+/datum/component/areabound/Destroy(force, silent)
+	QDEL_NULL(move_tracker)
+	. = ..()