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/modular_computers/hardware/ai_slot.dm

@@ -11,8 +11,8 @@
 	var/locked = FALSE
 
 ///What happens when the intellicard is removed (or deleted) from the module, through try_eject() or not.
-/obj/item/computer_hardware/ai_slot/Exited(atom/A, atom/newloc)
-	if(A == stored_card)
+/obj/item/computer_hardware/ai_slot/Exited(atom/movable/gone, direction)
+	if(stored_card == gone)
 		stored_card = null
 	return ..()
 

code/modules/modular_computers/hardware/battery_module.dm

@@ -20,8 +20,8 @@
 	return ..()
 
 ///What happens when the battery is removed (or deleted) from the module, through try_eject() or not.
-/obj/item/computer_hardware/battery/Exited(atom/A, atom/newloc)
-	if(A == battery)
+/obj/item/computer_hardware/battery/Exited(atom/movable/gone, direction)
+	if(battery == gone)
 		battery = null
 		if(holder?.enabled && !holder.use_power())
 			holder.shutdown_computer()

code/modules/modular_computers/hardware/card_slot.dm

@@ -9,8 +9,8 @@
 	var/obj/item/card/id/stored_card
 
 ///What happens when the ID card is removed (or deleted) from the module, through try_eject() or not.
-/obj/item/computer_hardware/card_slot/Exited(atom/A, atom/newloc)
-	if(A == stored_card)
+/obj/item/computer_hardware/card_slot/Exited(atom/movable/gone, direction)
+	if(stored_card == gone)
 		stored_card = null
 		if(holder)
 			if(holder.active_program)