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/modules/mob/living/simple_animal/slime/slime.dm

@@ -118,7 +118,7 @@
 	if(stat != DEAD)
 		icon_state = icon_text
 		if(mood && !stat)
-			add_overlay(image('icons/mob/slimes.dmi', icon_state = "aslime-[mood]"))
+			add_overlay("aslime-[mood]")
 	else
 		icon_state = icon_dead
 	..()