Machine var shim (#18644)

* removal of machine var

* shimsham

* deprecation warnings

* COMSIG_LIVING_HANDLE_VISION signal

* improved

* more cleanup

* more fixes

* this is fine

* fixed radios

* notices for now, tgui fix

* cleaned up hud and vision parent calls, adds COMSIG_LIVING_HANDLE_HUD

* radios use tgui now

* guestpass does not need machine anymore

* cloning machine doesn't use it

* this arcade machine is tgui too

* autolathe does not need machine

* remaining cleanup

* doc fix

* fix

* logout handling

---------

Co-authored-by: Cameron Lennox <killer65311@gmail.com>

code/modules/refinery/equipment/smart_centrifuge.dm

@@ -16,7 +16,7 @@
 	default_apply_parts()
 
 /obj/machinery/smart_centrifuge/attackby(var/obj/item/O as obj, var/mob/user as mob)
-	if(in_use)
+	if(working)
 		to_chat(user, "<span class='notice'>\The [src] is still spinning.</span>")
 		return
 	if(default_deconstruction_screwdriver(user, O))