VLC media player 3.0.21

[Stefan]

Changes between 3.0.20 and 3.0.21:

Decoders:
 * Improve Opus ambisonic support
 * Fix some ASS subtitle rendering issues
 * Fix Opus in MP4 behaviour
 * Fix VAAPI hw decoding with some drivers

Input:
 * Add support for HTTP content range handling according to RFC 9110
 * Fix some HLS Adaptive Streaming not working in audio-only mode

Video Output:
 * Super Resolution scaling with AMD GPUs
 * The D3D11 HDR option can also turn on/off HDR for all sources regardless of
   the display
 * Improve subtitles rendering on Apple platforms of notably Asian languages
   by correcting font fallback lookups

Video Filter:
 * New AMD VQ Enhancer filter
 * Add D3D11 option to use NVIDIA TrueHDR to generate HDR from SDR sources

Audio Output:
 * Fix regression on macOS causing crashes when using audio devices
   with more than 9 channels

Services Discovery:
 * Fix exposed UPnP directory URL schemes to be compliant with RFC 3986

Contrib:
 * Update FFmpeg to 4.4.4
 * Update dav1d to 1.4.2
 * Update libvpx to 1.14.1

libVLC:
 * the HWND passed to libvlc_media_player_set_hwnd must have the WS_CLIPCHILDREN
   style set.
 * Fix crashes when using caopengllayer

Misc:
 * Fix various warnings, leaks and potential crashes
 * Fix security integer overflow in MMS module