Bookshelf w/ enchanted book by table makes that enchantment more likely

The chiselled bookshelf can now store specific enchantment books. The current enchantment system is very annoying for the player, as there is no way for them to control or know what enchantments they will get. This is unbalanced compared to villager trading, where this information is readily provided (with xp gained rather than taken).

To balance this, if players have already 'discovered' an enchantment, they can place it in the chiselled bookshelf around an enchantment table. If so, the enchantment table is far more likely to give that enchantment.

This makes enchantment tables more reliable, more controllable by the player, adds progression, and gives a use to the chiselled bookshelf as opposed to just storing books decoratively.