[musicdb] rewrite the info scanner, music database and gui windows for musicbrainz
[musicbrainz] Update the Scanner & Scrapers to support ID resolution for MusicBrainzIDs
[musicdb] move some code so we can refactor the findalbuminfo methods
[musicdb] add join phrase to musicbrainz to support album artist resolution from musicbrainz
[musicdb] implement a per host rate-limiter to avoid hitting the musicbrainz rate-limit and be more friendly to our peers. also update the MB scrapers so they cache properly (caching by filename) to remove www. and make http://musicbrainz.org the standard.