Fix Playlist Media management (#109)
Fix Playlist Media management (#109)

* Fix Playlist Media management

Change mid.length > 0 check to mid.length === 0 to fix playlistMoveMedia
Create function removeSongFromPlaylist
Don’t accept empty arrays in removeSongFromPlaylist
Allow non empty arrays in playlistMoveMedia
Change method of REST request from GET to POST in addSongToPlaylist
Change song ID of type Number to song data of type Object or Object
array
Allow multiple songs added at once if sdata is an Array
plugCubed/plugAPI,anjanms/plugAPI