fixes#674
I accidentally broke PiP when using MPV. While testing this, I noticed that PiP sometimes does not start, so I tried to make MPV to PiP a bit more robust.
HLS: try matching the set resolution. This works okay with AVPlayer. With MPV it is hit and miss, most of the time MPV targets the highest available bitrate, instead of the set bitrate.
AVPlayer now supports higher resolution up to 1080p60.
- The order of the formats can now be changed in the Quality Settings.
- sortingOrder is now part of QualitiyProfile.
- bestPlayable is now part of PlayerBackend.
- hls and stream aren't treated as unknown anymore.
