Replaces /image with /mutable_appearance (#556)

* Replaces /image with /mutable_appearance, where appropriate

* Update miscellaneous.dm

* Delete miscellaneous.dm.rej

* Delete pet.dm.rej

* Update pet.dm

* Update species.dm

* Update miscellaneous.dm

* Update species.dm

* Update miscellaneous.dm

* Delete species.dm.rej

* Update species.dm

pretty sure I got all the indentation correct THIS time, ffs

* Update species.dm

* Update species.dm

fucking tabs man, fucking tabs.

code/game/objects/structures/watercloset.dm

@@ -239,7 +239,7 @@
 		qdel(mymist)
 
 	if(on)
-		add_overlay(image('icons/obj/watercloset.dmi', src, "water", MOB_LAYER + 1, dir))
+		add_overlay(mutable_appearance('icons/obj/watercloset.dmi', "water", MOB_LAYER + 1))
 		if(watertemp == "freezing")
 			return
 		if(!ismist)