Grind Enchantments

• Added an option to consume the item when disenchanting.
• No longer create an empty enchanted book when an item has only curses applied to it (fixes #14).
• The game no longer crashes when trying to move enchantments from a book with more than one curse.
• The game no longer crashes if the config file could not be decoded correctly.

Note: This release also works in the 1.18 experimental snapshots.