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/tgui/modules/ntos-only/uav.dm

@@ -177,7 +177,7 @@
 	if(!current_uav)
 		return
 
-	if(user.machine != tgui_host())
+	if(!user.check_current_machine(tgui_host()))
 		user.set_machine(tgui_host())
 	current_uav.add_master(user)
 	LAZYDISTINCTADD(viewers, WEAKREF(user))

code/modules/tgui/modules/overmap.dm

@@ -31,7 +31,7 @@
 
 /datum/tgui_module/ship/tgui_status(mob/user)
 	. = ..()
-	if(viewing_overmap(user) && (user.machine != src))
+	if(viewing_overmap(user) && (!user.check_current_machine(src)))
 		user.reset_perspective()
 
 /datum/tgui_module/ship/tgui_close(mob/user)

code/modules/tgui/tgui.dm

@@ -175,6 +175,9 @@
 		if(user.client)
 			terminate_byondui_elements()
 
+	// Unset machine just to be sure.
+	user.unset_machine()
+
 	state = null
 	if(parent_ui)
 		parent_ui.children -= src