Currently if we have enough known data to identify a release we can go:
- release + tracknumber -> track title
- release + track title -> tracknumber
But one less circular option is:
- release + track length -> track -> track title & tracknumber
This could be its own getter in TrackNumberFinder and TitleFinder.
The current getMBKnownData could be renamed getMBKnownDataWithTitle and getMBKnownDataWithTrackNumber, respectively.
The new getter could be called getMBKnownDataTrackLength.
This would require changes to our MB code to allow a length filter attribute.