Move gst-libav to gst-ffmpeg
It's confusing for our users to have a repository named after a internal library. Externals know FFMPEG, only the close users of FFMPEG knows that it's internal library is libav. It was also moved as libav as a political move if I remember properly.
- Less user confusion, more consistent naming
- Distros/packagers will have to rename things on their side and add backwards-compat gst-libav packages that point back to the new gst-ffmeg