Fixed issue with online albums

Only the first albums were retrieved
add warning when no track playing
Skip null tracks
Do not rely on playable anymore

it is based on available_markets, but I find it really unreliable..
In any case, Spotify tries to find a best match if you use a
non-playable track..
Added single and compilation for online lookups
Possibility to create a playlist in Add menu

+ own icon for recreate library
minor change to display
minor change to display
Add specific icon for add to AP or Your Music

+ change name to all playlists.png to your music.png
Added command add_current_track_to

This will display the Add menu, with current track:
-Remote available
-Keyword available
-Quick access
changed logo for current track
Update->Refresh library for Remote
Added number of tracks for online albums
added query_artist_online command

-Remote Query Artist Online
-Quick access
minor description change
display error for local tracks