Add CallFailure error handling to gmsync
Add regex to handle <tracknumber>/<totaltracks>
Improve handling for track numbers of 0 and 00
Some tracks may have a track number of 0. Google Music does not allow/return track numbers of 0. To handle this, reduce multiple 0's in local track numbers to a single 0 while adding a track number of 0 to local and Google Music tracks without a track number.