Updated buyingstore items
-- Merging item_buyingstore.txt to item_flag.txt with flag value, 4.
-- Sync the buyingstore items based on https://github.com/ROClientSide/Translation/blob/master/Data/buyingstoreitemlist.txt (last git check on 2014-05-2), Thank ROClientSide.
-- Commented item means the item is not avaialble in item_db.txt yet (just like before).

Signed-off-by: Cydh Ramdh <house.bad@gmail.com>