Reverted some layer adjustments I did that seem to have broken things, bugfixes for operating tables, choking people, and CPR, giving. Also added sterile mask box sprite, and tossed the singularity crap into a spawn(0) to try and reduce lag.

code/WorkInProgress/SkyMarshal/wardrobes.dm

@@ -5,7 +5,6 @@
 	icon_state = "wardrobe_sealed"
 	item_state = "wardrobe"
 	w_class = 4
-	layer = 2.9
 	var
 		descriptor = "various clothing"
 		seal_torn = 0