Counts the total number of tracks in the given array of CrateFolders.

FindCrateFolders searches the given folder for music tracks that Mixxx can play.

FindTrackFiles finds all tracks that can be played by Mixxx in a given folder.

FindTrackIDs searches the DB to find the track IDs corresponding to the given track files.

IsTrackFile detects if a file at the given path is indeed a track that can be played by Mixxx.

NameCrate creates a name for a crate based on its path relative to the music library.

UpdateCrateInDB ...

TrackFile is a filepath to a music file that can be played by Mixxx.