Refactors move procs to support multitle objects (#59658)

Enter(), Entered(), Exit() and Exited() all passed the old loc forward, but everything except a single a case cared about the direction of the movement more than about the specific source.
Since moving multi-tile objects will have multiple sources of movement but a single direction, this change makes it easier to track their movement.

Cleaned up a lot of code around and made proc inputs compatible.

I'll add opacity support for multi-tile objects in a different PR after this is merged, as this has grown large enough and I don't want to compromise the reviewability.

Tested this locally and as expected it didn't impair movement nor produced any runtimes.

code/game/objects/items/robot/robot_items.dm

@@ -805,12 +805,12 @@
 		stored.forceMove(get_turf(src))
 		stored = null
 
-/obj/item/borg/apparatus/Exited(atom/A)
-	if(A == stored) //sanity check
+/obj/item/borg/apparatus/Exited(atom/movable/gone, direction)
+	if(gone == stored) //sanity check
 		UnregisterSignal(stored, COMSIG_ATOM_UPDATED_ICON)
 		stored = null
 	update_appearance()
-	. = ..()
+	return ..()
 
 ///A right-click verb, for those not using hotkey mode.
 /obj/item/borg/apparatus/verb/verb_dropHeld()