VLC media player 3.0.19 'Vetinari'

This is the twentieth release of VLC 3.0 branch, named "Vetinari",
in reference to the Lord Patrician from Discworld.

This update contains numerous fixes and improvements, notably:
- a fix for a major FLAC regression,
- a fix for next-frame freezing the app,
- hardware decoding for AV1 and other improvements for AV1,
- improvements for Wav (RIFF INFO), MP4, AVI (Qnap, GBRP), RealVideo,
- Super Resolution scaling with Intel and nVidia hwardware,
- mumerous fixes for various files support,
- fixes for hardware decoding on Windows, Android and macOS,
- other fixes and security updates.