Planes Framework (#4545)

* Polaris initial plane upstream merge

* POLARIS: Fix RIG visors with new plane system, and material scanner VIS_FULLBRIGHT

* POLARIS: Fix GetFlatIcon so that cameras and id pictures don't show the HUD overlays.

* POLARIS: Adds a 'alter values' proc for plane master ease of tweaking

Setting stuff like colorblindness variety and things.

* Remove NIF reference, fix lighting layer define

* Handle effects above lighting plane

* Moved all layer defines to planes+layers.dm
* Fixed overlays that are supposed to be above lighting to use the PLANE_LIGHTING_ABOVE

* Merge: 3000% human/update_icons() speed improvement

* Merge: Avoid ghosts pointing at things

code/game/objects/structures/curtains.dm

@@ -1,6 +1,3 @@
-#define SHOWER_OPEN_LAYER OBJ_LAYER + 0.4
-#define SHOWER_CLOSED_LAYER MOB_LAYER + 0.2
-
 /obj/structure/curtain
 	name = "curtain"
 	icon = 'icons/obj/curtain.dmi'

code/game/objects/structures/flora/trees.dm

@@ -198,5 +198,6 @@
 
 /obj/structure/flora/tree/sif/update_icon()
 	set_light(5, 1, "#33ccff")
-	overlays.Cut()
-	overlays.Add(image(icon = 'icons/obj/flora/deadtrees.dmi', icon_state = "[icon_state]_glow", layer = LIGHTING_LAYER + 0.1))
+	var/image/glow = image(icon = 'icons/obj/flora/deadtrees.dmi', icon_state = "[icon_state]_glow")
+	glow.plane = PLANE_LIGHTING_ABOVE
+	overlays = list(glow)

code/game/objects/structures/morgue.dm

@@ -48,7 +48,7 @@
 				else
 					src.icon_state = "morgue3"
 					if(broadcast)
-						broadcast_medical_hud_message("[src] was able to establish a mental interface with occupant.", src)
+						global_announcer.autosay("[src] was able to establish a mental interface with occupant.", "[src]", "Medical")
 		else
 			src.icon_state = "morgue1"
 	return