Store playlist information to database

[niksudan]

For logging purposes, this would be a good thing to have. Doesn't need to be a massive MySQL db, just SQLite will do.

Should store the following information:

• Playlist (id, from, to)
• Track (uri, source, name, albumId, artistIds, requesterId, playlistId)
• Artist (id, name)
• Album (id, name)
• Requester (id, name)