Add hidden option lookup_local_tracks_online

This is to lookup online a local track in order to find a match and
replace it.
It takes more time to update the library with this option.
This is until
http://stackoverflow.com/questions/27533743/local-tracks-returned-as-nul
l-by-spotify-web-api?noredirect=1#comment43496449_27533743 is fixed
Added stat hat for lyrics