PrimeSeller-Fork

Material counting system improved:

1. Broken items, enchanted items, and items with PersistentData will no longer be accepted by the buyer. (To sell an enchanted item, players can remove its enchantments using a grindstone and then sell it.)
2. Now, when ENCHANTED_BOOK is added to the list of sellable items, players will be able to sell any enchanted books.
3. Money is now only granted for actually removed items. Bugs where players could receive more money than the number of items removed have been fixed.