Better Enchanted Books

Give enchanted books multiple uses instead of consuming them in an anvil. And make adding enchanted books in an anvil a static exp cost based on level/rarity so it never gets "too expensive"

To balance this, remove the ability to enchant books directly through the enchantment table. Instead they will be exclusively found from structures and librarians. Have the enchanted books lose their magical properties over time until they "break" like the elytra, having to be recharged with some sort of cost like exp and/or lapis.