Adds drop_stack() helper proc
Created by: unid15
var/obj/item/stack/tile/mineral/uranium/U = locate(/obj/item/stack/tile/mineral/uranium) in user.loc
if(U && U.type==/obj/item/stack/tile/mineral/uranium && U.amount<U.max_amount)
U.amount++
to_chat(user, "You add a uranium tile to the stack. It now has [U.amount] tiles.")
return
U = new(user.loc)
turns into
drop_stack(/obj/item/stack/tile/mineral/uranium, user.loc, 1, user)