Add Lorcana card lookup

[Didero]

This adds a build script to add Lorcana cards to the cards database, in the same style as 'build_carddb_mtg'. It also adds the '!lorcana' command to look up the cards, again in the same way as the other card lookups work.

It doesn't hook the Lorcana data up to the card reader code, because I don't know how that works and didn't want to make too big a pull request.

[Didero]

Thanks for the feedback! I've implemented all your comments.

[andreasots]

Thanks!