SSAO object excludes

Moves several things onto a new plane/layer to keep them from getting the SSAO shadows so it looks nicer.

code/game/objects/structures/crates_lockers/closets/secure/medical.dm

@@ -313,6 +313,8 @@
 	icon_opened = "medical_wall_open"
 	icon_broken = "medical_wall_spark"
 	icon_off = "medical_wall_off"
+	plane = TURF_PLANE
+	layer = ABOVE_TURF_LAYER
 	anchored = 1
 	density = 0
 	wall_mounted = 1

code/game/objects/structures/crates_lockers/closets/utility_closets.dm

@@ -215,6 +215,8 @@
 	icon_state = "hydrant"
 	icon_closed = "hydrant"
 	icon_opened = "hydrant_open"
+	plane = TURF_PLANE
+	layer = ABOVE_TURF_LAYER	
 	anchored = 1
 	density = 0
 	wall_mounted = 1

code/game/objects/structures/extinguisher.dm

@@ -3,6 +3,8 @@
 	desc = "A small wall mounted cabinet designed to hold a fire extinguisher."
 	icon = 'icons/obj/closet.dmi'
 	icon_state = "extinguisher_closed"
+	plane = TURF_PLANE
+	layer = ABOVE_TURF_LAYER
 	anchored = 1
 	density = 0
 	var/obj/item/weapon/extinguisher/has_extinguisher

code/game/objects/structures/signs.dm

@@ -3,7 +3,8 @@
 	anchored = 1
 	opacity = 0
 	density = 0
-	layer = ABOVE_JUNK_LAYER
+	plane = TURF_PLANE
+	layer = ABOVE_TURF_LAYER
 	w_class = ITEMSIZE_NORMAL
 
 /obj/structure/sign/ex_act(severity)