bunch of global vars (#19091)

* bunch of global vars

* .

code/modules/turbolift/_turbolift.dm

@@ -9,4 +9,4 @@
  * bunch of ChangeTurf() calls.
  */
 
-var/list/turbolifts = list()
+GLOBAL_LIST_EMPTY(turbolifts)

code/modules/turbolift/turbolift_map.dm

@@ -15,12 +15,12 @@
 	var/list/areas_to_use = list()
 
 /obj/turbolift_map_holder/Destroy()
-	turbolifts -= src
+	GLOB.turbolifts -= src
 	return ..()
 
 /obj/turbolift_map_holder/Initialize(mapload)
 	..()
-	turbolifts += src
+	GLOB.turbolifts += src
 	return INITIALIZE_HINT_LATELOAD
 
 /obj/turbolift_map_holder/LateInitialize()