[Feature Request] Sorting for Playlists

[Shousokon]

It would be cool to be able to sort a playlist, similar to what you can do on spotify:

I myself like to sort a playlist the way, that recently added songs to the playlist show at the top. This would be a huge benefit in my playlists, especially if they contain a lot of tracks.

Edit: Sorting the playlists themself on the /playlists page would be also nice