Multi user Card database

[mrf7]

End goal is to have a database setup that allows us to track the full collection of an arbitrary number of users as well.

Also want to be able to track decklists for users in a way that lets you associate specific cards in your collection with a deck so you can track where your cards are and what you need to complete your deck. The deck bit may take a decent amount of effort so might want to split that bit out