More and more Destroy() cleanups all across the board - Return qdel hints.

code/_onclick/hud/ability_screen_objects.dm

@@ -20,7 +20,7 @@
 		message_admins("ERROR: ability_master's New() was not given an owner argument.  This is a bug.")
 
 /obj/screen/movable/ability_master/Destroy()
-	..()
+	. = ..()
 	//Get rid of the ability objects.
 	remove_all_abilities()
 	ability_objects.Cut()

code/_onclick/hud/action.dm

@@ -30,6 +30,9 @@
 /datum/action/Destroy()
 	if(owner)
 		Remove(owner)
+	target = null
+	qdel_null(button)
+	return ..()
 
 /datum/action/proc/Grant(mob/living/T)
 	if(owner)
@@ -45,7 +48,7 @@
 	if(button)
 		if(T.client)
 			T.client.screen -= button
-		del(button)
+		qdel_null(button)
 	T.actions.Remove(src)
 	T.update_action_buttons()
 	owner = null

code/_onclick/hud/hud.dm

@@ -155,7 +155,7 @@ datum/hud/New(mob/owner)
 	..()
 
 /datum/hud/Destroy()
-	..()
+	. = ..()
 	grab_intent = null
 	hurt_intent = null
 	disarm_intent = null

code/_onclick/hud/screen_objects.dm

@@ -46,7 +46,7 @@
 	var/obj/item/owner
 
 /obj/screen/item_action/Destroy()
-	..()
+	. = ..()
 	owner = null
 
 /obj/screen/item_action/Click()

code/_onclick/hud/spell_screen_objects.dm

@@ -13,7 +13,7 @@
 	var/mob/spell_holder
 
 /obj/screen/movable/spell_master/Destroy()
-	..()
+	. = ..()
 	for(var/obj/screen/spell/spells in spell_objects)
 		spells.spellmaster = null
 	spell_objects.Cut()
@@ -156,7 +156,7 @@
 	var/icon/last_charged_icon
 
 /obj/screen/spell/Destroy()
-	..()
+	. = ..()
 	spell = null
 	last_charged_icon = null
 	if(spellmaster)