Soundcloud songs can't be played

[Raveberry]

Due do changes in Soundcloud's API, Raveberry is currently not able to play songs from Soundcloud.
Mopidy-Soundcloud is still able to play songs, but it requires the Soundcloud-internal ID to do that.
Previously, Raveberry fetched this id using the now deprecated python-soundcloud module.
In order to restore this functionality, we would need:

• A python library that interfaces with Soundcloud, or a manual implementation of the necessary functionality.
• Ability to register new Soundcloud Apps (https://soundcloud.com/you/apps/new)
• An OAuth endpoint to let people create their own client_id/client_secret