Change implementation of Tracklist / Track
Mostly refactoring
Modularize QSpotifySearch & Clean Code
Allow preview and specifc search in QSpotifySearch
Add an artistModel
Add and album list model
Add a playlistsearchentry list model
Fix models for qml usage
Improve search class with a preview function
Offer a way to get an albumBrowse for an album in a list
Make artistBrowse available from artistList
Add a TODO
Allow to get full playlist from playlistsearch list