Mob inventory cleanup

Replaces three item removal procs with one
Adds a proc to delete an item on the mob

code/game/objects/items/devices/modkit.dm

@@ -23,8 +23,7 @@
 
 	if(!parts)
 		user << "<span class='warning'>This kit has no parts for this modification left.</span>"
-		user.drop_from_inventory(src)
-		qdel(src)
+		user.deleteItem(src)
 		return
 
 	var/allowed = 0
@@ -59,8 +58,7 @@
 		parts &= ~MODKIT_SUIT
 
 	if(!parts)
-		user.drop_from_inventory(src)
-		qdel(src)
+		user.deleteItem(src)
 
 /obj/item/device/modkit/examine(mob/user)
 	..(user)