Removed Debugging and cleaned up Spotify

Removed debugging of tracking method execution because it wasn't really
ever used by users.  I can track this information with VS itself.

I cleaned up Spotify's artwork code and moved downloading of the JSON to
its own method.  Some code was moved from the HandleSpotifyAlbumArtwork
method over to the DownloadSpotifyAlbumArtwork.  This effectively
resolved the last code analysis warning about code complexity.