SSoverlays for human icons, mostly works

Closer to working 100%

But legitimately /tg/ icons

Move lighting to it's own plane, fix observers

Fix humans layering over other objects incorrectly

Nyaaaaa~

code/modules/surgery/organs/organ_internal.dm

@@ -64,6 +64,7 @@
 			log_runtime(EXCEPTION("[src] attempted to remove from a [parent_organ], but [parent_organ] didn't exist! [atom_loc_line(M)]"), src)
 		else
 			parent.internal_organs -= src
+		H.update_int_organs()
 
 	for(var/X in actions)
 		var/datum/action/A = X
@@ -105,6 +106,10 @@
 	insert(H)
 	return 1
 
+// Rendering!
+/obj/item/organ/internal/proc/render()
+	return
+
 /obj/item/reagent_containers/food/snacks/organ
 	name = "appendix"
 	icon_state = "appendix"
@@ -247,7 +252,7 @@
 		to_chat(owner, "<font color='red' size='7'>HONK</font>")
 		owner.SetSleeping(0)
 		owner.Stuttering(20)
-		owner.AdjustEarDeaf(30)
+		owner.MinimumDeafTicks(30)
 		owner.Weaken(3)
 		owner << 'sound/items/AirHorn.ogg'
 		if(prob(30))