Mostly removes creation of throwaway objects from chameleon items

- Replaces the creation of throwaway items from New() with initial() calls for all chameleon items.
- Unfortunately throwaway items could not be removed when switch appearance, as initial() does not work very will with list vars.
- Makes chameleon item name cache lists global.
- Makes chameleon guns a subtype of energy guns, removes chameleon magazines.
- Moves chameleon.dm to clothing module root
- Items without icon or icon_state are no longer selectable as chameleon appearances.
- Chameleon verbs go in their own panel.

code/modules/projectiles/guns/energy.dm

@@ -36,7 +36,6 @@
 		fire_sound = isnull(current_mode.fire_sound)? initial(fire_sound) : current_mode.fire_sound
 
 		update_icon()
-		update_held_icon()
 
 /obj/item/weapon/gun/energy/emp_act(severity)
 	..()
@@ -115,4 +114,4 @@
 			icon_state = "[modifystate][ratio]"
 		else
 			icon_state = "[initial(icon_state)][ratio]"
-
+	update_held_icon()