Change card dealing to be identity, not user based

Currently cards are dealt to user's, not identities. Given the support for multiple identities per user, it would make more sense to have one card dealing window per identity.

Some form of identifier should be added to the windows, so users with multiple identities can differentiate them.

As an added bonus, adding an identity to the "public" hand would also help differentiate it, as currently it looks identical to a users hand.