Upload to usdb (for mods and admins)

[bohning]

The idea is to (batch) upload a song right away after the download with all the Syncer fixes in place.

I am unsure what is the best way to reconstruct the meta-tags. Except for the medley tags, they should be unchanged, while the medley tags might need to be updated if the song’s BPM was changed by the Syncer.

For now, I used the str() of the MetaTags class, but it doesn’t feel right and there sure is a better way. Looking forward to your feedback and help.