Librarians Book Copying Trade

The idea is, that you can now put enchanted books into a lectern. Also master librarians will have a new special trade. If a lectern with a book in it is used as a workstation, the villager will sell a copy of this book. This will work for book and quill, signed books, as well as enchanted books. The prices of this trade would vary depending on the length in the case of written books and rarity in the case of enchanted books. Little problem would be books with multiple good enchants. In some cases 64 emeralds would be too cheap of a price. Another thing that would need to change is librarian trade resetting, in order to make obtaining an original book more challenging. This would be achieved by removing the enchanted book trade from the novice tier.