Automatically download newly added songs to playlist

[invertedEcho]

First of all: Thank you very much for this nice app!

It would be really nice to have the option to mark a playlist as "Downloaded". Once a playlist is marked, when the user adds new songs to the playlist, amperfy will automatically download the songs.

[Endareth]

Auto syncing playlist downloads would be amazing! Could finally ditch the iOS Music app completely!