Feature Request: Export playlists to m3u files

[IUCCA]

With this ability it is possible, to use playlists on devices without subsonic client.

[sentriz]

good idea thanks. this will also help with #54 if a backup system is needed

[helmut72]

Also miss exporting playlists. This feels like a one way, but no way out. I can't imagine to create playlists when using Gonic and then everything is lost, if I decide to switch to another Subsonic compatible server or want to use playlists otherwise, for example deleting files from a "delete" playlist.

[IUCCA]

I wrote a little python script, which exports the playlists. https://github.com/IUCCA/gonic_playlist_export

[helmut72]

Thanks! This is was the most important missed feature.

Today I've tested your script in Gonics official Docker image. Added python3 and py3-sqlalchemy. I need to replace int to str in your script:
items = list(map(str, (i[3].split(','))))