Merge pull request #48 from blorp77/upstream

Modifications to all_faves to allow sid as argument to display cooldown.

Pull request merge : Added request_favourited_songs to allow filling requests with favourited songs. It seems to work on my limited environment, further testing on the full library would be good. You could add it to the backend and I'll test it with URLs. My frontend dev isn't working for now.
Re-add R3 JS file for admin panel