Web player improvement: add "Most recently added" playlist sorting

[kensek]

Where I work there is no option to install the player on work pc's, as installing apps and such is locked by the employer. Therfore I am happy that you still provide a web player. But one function i miss greatly in the web player is the ability to sort your playlists like you can in the app... My favorite method of sorting is "Most recently added" I hope you will still provide a web player in the long run, and keep it somewhat up to date like your app 🙂