Changes to List songs

added the required property song/items/mood to the response with the 200 status

added the required property song/items/bpm to the response with the 200 status

added the required property song/items/last_played to the response with the 200 status

api operation id songs was added

added the non-success response with the status 401

added the non-success response with the status 403

added the non-success response with the status 404

added the non-success response with the status 500

the response property song/items/album/basename became nullable for the status 200

the response property song/items/album/name became nullable for the status 200

the response property song/items/album/prefix became nullable for the status 200

the response property song/items/albumartist/basename became nullable for the status 200

the response property song/items/albumartist/name became nullable for the status 200

the response property song/items/albumartist/prefix became nullable for the status 200

the response property song/items/artist/basename became nullable for the status 200

the response property song/items/artist/name became nullable for the status 200

the response property song/items/artist/prefix became nullable for the status 200

the response property song/items/artists/items/basename became nullable for the status 200

the response property song/items/artists/items/name became nullable for the status 200

the response property song/items/artists/items/prefix became nullable for the status 200

added the required property md5 to the response with the 200 status

added the required property song to the response with the 200 status

added the required property total_count to the response with the 200 status

added the non-success response with the status 400