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/structures/window.dm

@@ -124,7 +124,7 @@
 
 	return TRUE
 
-/obj/structure/window/proc/on_exit(datum/source, atom/movable/leaving, atom/new_location)
+/obj/structure/window/proc/on_exit(datum/source, atom/movable/leaving, direction)
 	SIGNAL_HANDLER
 
 	if (istype(leaving) && (leaving.pass_flags & pass_flags_self))
@@ -133,7 +133,7 @@
 	if (fulltile)
 		return
 
-	if(get_dir(leaving.loc, new_location) == dir && density)
+	if(direction == dir && density)
 		leaving.Bump(src)
 		return COMPONENT_ATOM_BLOCK_EXIT