Action Button Update

- Refactors action button backend
   - Action buttons are no longer checked on Life(), items are responsible
     for adding/removing/updating them.
   - Item action buttons are no longer a static action_button_name define,
     items define actions_types, which is a list of paths.
   - Items can now have multiple action buttons.
     - This is handled by new arguments to ui_action_click, the first
       parameter is the user, the second is the path of the action datum
       that was invoked.
 - Refactored how internals function
   - You may now directly switch internals without breaking anything.
   - The internals icon has been updated to be more consistent.
 - Added action buttons for jetpacks
 - Added action buttons for oxygen tanks
 - Uses-based implants now qdel() themselves when they run out of uses.
   This is somewhat a buff to traitor implants, but it's such a minor
   change. The actual reasoning is so that the action buttons are properly
   removed.
 - Fixed a bug with the "Boo" spell which resulted in IsAvailable failing
   for certain ghosts.
 - You can now shift-click on movable HUD elements to reset them to the
   proper position (thank fucking christ)

code/modules/mob/mob.dm

@@ -1053,6 +1053,7 @@ var/list/slot_equipment_priority = list( \
 			layer = initial(layer)
 
 	update_transform()
+	update_action_buttons_icon()
 	return canmove
 
 /mob/proc/fall(var/forced)
@@ -1368,16 +1369,7 @@ mob/proc/yank_out_object()
 
 /mob/proc/AddSpell(var/obj/effect/proc_holder/spell/spell)
 	spell_list += spell
-	if(!spell.action)
-		spell.action = new/datum/action/spell_action
-		spell.action.target = spell
-		spell.action.name = spell.name
-		spell.action.button_icon = spell.action_icon
-		spell.action.button_icon_state = spell.action_icon_state
-		spell.action.background_icon_state = spell.action_background_icon_state
-	if(isliving(src))
-		spell.action.Grant(src)
-	return
+	spell.action.Grant(src)
 
 //override to avoid rotating pixel_xy on mobs
 /mob/shuttleRotate(rotation)