Normalize the bingo_boards schema

[ioistired]

• bingo_boards(user_id, value INTEGER)
• bingo_categories(category_id, content)
• bingo_board_categories(user_id, position, category_id REFERENCES bingo_categories)

As for marks:

• bingo_board_marks(user_id, position, emote_id REFERENCES emotes, nsfw boolean, deleted_emote_id INTEGER, deleted_emote_animated)

If emote_id is set, the following columns are NULL and should be obtained from emotes. Otherwise they are used as is (see #65). Also experiment with obtaining the images on the fly vs storing them in the database.

[ioistired]

Fixed in 1cb15d552da45b89970504cc86f76e42e1ff96d3..064a7e0db23a6c144139287ff5bd9d25bee7ebd1