Replace saved tracks and albums with TV

[Roshy10]

In addition to changing the contents of playlists, add an option to replace likes tracks and albums too, enabled by default

https://developer.spotify.com/documentation/web-api/reference/#/operations/save-tracks-user

[SubjunctiveQuaver]

Ooh this is cool -- although usually I don't mind keeping the old tracks liked in addition to the new ones (though I personally never listen to liked songs only).