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Our SSOverlays system is outdated, and is likely the cause of many of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/modules/overmap/overmap_object.dm

@@ -177,7 +177,7 @@
 		C.targeting = FALSE
 		targeting = O
 		O.targeted_overlay = icon('icons/obj/overmap/overmap_effects.dmi', "lock")
-		O.add_overlay(O.targeted_overlay)
+		O.AddOverlays(O.targeted_overlay)
 		if(designation && class && !obfuscated)
 			if(!O.maptext)
 				O.maptext = SMALL_FONTS(6, "[class] [designation]")
@@ -207,6 +207,6 @@
 	if(C)
 		playsound(C, 'sound/items/rfd_interrupt.ogg', 70)
 	if(O)
-		O.cut_overlay(O.targeted_overlay)
+		O.CutOverlays(O.targeted_overlay)
 		O.maptext = null
 	targeting = null