Conversion many Globals to Managed Globals (Part 1) (#17121)

* Conversion of some Globals to Managed Globals

* Fix

* for later

---------

Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>

code/modules/overmap/helpers.dm

@@ -1,5 +1,5 @@
 /proc/get_overmap_sector(var/z)
 	if(using_map.use_overmap)
-		return map_sectors["[z]"]
+		return GLOB.map_sectors["[z]"]
 	else
 		return null

code/modules/overmap/sectors.dm

@@ -148,7 +148,7 @@
 
 /obj/effect/overmap/visitable/proc/register_z_levels()
 	for(var/zlevel in map_z)
-		map_sectors["[zlevel]"] = src
+		GLOB.map_sectors["[zlevel]"] = src
 
 	global.using_map.player_levels |= map_z
 	if(!in_space)
@@ -161,7 +161,7 @@
 	*/
 
 /obj/effect/overmap/visitable/proc/unregister_z_levels()
-	map_sectors -= map_z
+	GLOB.map_sectors -= map_z
 
 	global.using_map.player_levels -= map_z
 	if(!in_space)

code/modules/overmap/turfs.dm

@@ -1,5 +1,5 @@
 //Dimension of overmap (squares 4 lyfe)
-var/global/list/map_sectors = list()
+GLOBAL_LIST_EMPTY(map_sectors)
 
 /area/overmap
 	name = "System Map"