added sounds for sell menu.(thanks for Jcs35)

you can modify them.

fixed chest gui conflict for lore.

-1.16.5 InventoryView errors fixed and tested.
-Fixed multi-version and & protocollib problems.

1- Added refund for unsellable and blacklisted items.
2- /donutworth gui command added, here you can visually see the items and add or delete them from the blacklist, in addition you can change their prices
3- Calculation has come with the value of the items in the Shulker box.
4- Support for enchants has come, you can edit it from the bottom of config.yml, the value increases by multiplying at each enchant level.

-fixed item lore updating system (it will work always.)
-bug fixes in repeating decimals.
-working more stable.