Update SSOverlays (ported from Baystation) (#19051)

Our SSOverlays system is outdated, and is likely the cause of many of
the issues seen in #18895. It has also been linked to a massive server
performance decrease.

This brings an updated system from Baystation, hopefully with speed
increases.

Should be testmerged, ideally with #18895.

---------

Co-authored-by: Cody Brittain <cbrittain10@live.com>

code/game/objects/items/devices/multitool.dm

@@ -121,7 +121,7 @@
 			if(tracking_apc)
 				START_PROCESSING(SSprocessing, src)
 				apc_indicator = mutable_appearance(icon, "lost")
-				add_overlay(apc_indicator)
+				AddOverlays(apc_indicator)
 			else
 				STOP_PROCESSING(SSprocessing, src)
 				QDEL_NULL(apc_indicator)
@@ -169,7 +169,7 @@
 				apc_indicator.icon_state = "medium"
 			if(16 to INFINITY)
 				apc_indicator.icon_state = "far"
-	set_overlays(apc_indicator)
+	SetOverlays(apc_indicator)
 
 /obj/item/device/multitool/proc/wire(datum/integrated_io/io, mob/user)
 	if(!io.holder.assembly)