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/modules/mining/machine_processing.dm

@@ -48,7 +48,7 @@
 	* target - the atom that just moved onto the `source` turf.
 	* oldLoc - the old location that `target` was at before moving onto `source`.
 */
-/obj/machinery/mineral/proc/pickup_item(datum/source, atom/movable/target, atom/oldLoc)
+/obj/machinery/mineral/proc/pickup_item(datum/source, atom/movable/target, direction)
 	SIGNAL_HANDLER
 
 	return
@@ -200,7 +200,7 @@
 
 	return dat
 
-/obj/machinery/mineral/processing_unit/pickup_item(datum/source, atom/movable/target, atom/oldLoc)
+/obj/machinery/mineral/processing_unit/pickup_item(datum/source, atom/movable/target, direction)
 	if(QDELETED(target))
 		return
 	if(istype(target, /obj/item/stack/ore))

code/modules/mining/machine_redemption.dm

@@ -132,7 +132,7 @@
 	))
 	signal.send_to_receivers()
 
-/obj/machinery/mineral/ore_redemption/pickup_item(datum/source, atom/movable/target, atom/oldLoc)
+/obj/machinery/mineral/ore_redemption/pickup_item(datum/source, atom/movable/target, direction)
 	if(QDELETED(target))
 		return
 	if(!materials.mat_container || panel_open || !powered())

code/modules/mining/machine_unloading.dm

@@ -11,7 +11,7 @@
 	needs_item_input = TRUE
 	processing_flags = START_PROCESSING_MANUALLY
 
-/obj/machinery/mineral/unloading_machine/pickup_item(datum/source, atom/movable/target, atom/oldLoc)
+/obj/machinery/mineral/unloading_machine/pickup_item(datum/source, atom/movable/target, direction)
 	if(QDELETED(target))
 		return
 	if(istype(target, /obj/structure/ore_box))