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Our SSOverlays system is outdated, and is likely the cause of many of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/mob/abstract/new_player/menu.dm

@@ -153,7 +153,7 @@
 
 /obj/screen/new_player/selection/MouseEntered(location, control, params)
 	if(hud_arrow)
-		add_overlay(hud_arrow, force_compile = TRUE)
+		AddOverlays(hud_arrow)
 	else
 		var/matrix/M = matrix()
 		M.Scale(1.1, 1)
@@ -162,7 +162,7 @@
 
 /obj/screen/new_player/selection/MouseExited(location,control,params)
 	if(hud_arrow)
-		cut_overlays(force_compile = TRUE)
+		ClearOverlays()
 	else
 		animate(src, color = null, transform = null, time = 3, easing = CUBIC_EASING)
 	return ..()

code/modules/mob/abstract/observer/observer.dm

@@ -227,7 +227,7 @@ Works together with spawning an observer, noted above.
 
 /mob/proc/ghostize(var/can_reenter_corpse = TRUE, var/should_set_timer = TRUE)
 	if(ckey)
-		cut_overlay(image('icons/effects/effects.dmi', "zzz_glow")) // not very efficient but ghostize isn't called /too/ often.
+		CutOverlays(image('icons/effects/effects.dmi', "zzz_glow")) // not very efficient but ghostize isn't called /too/ often.
 		var/mob/abstract/observer/ghost = new(src)	//Transfer safety to observer spawning proc.
 		ghost.can_reenter_corpse = can_reenter_corpse
 		ghost.timeofdeath = src.stat == DEAD ? src.timeofdeath : world.time