* Use ffmpeg builds form github.com/BtbN/FFmpeg-Builds (gpl/lgpl, static/shared)
* fix property extract_dir
* remove lgpl variant - revert commit if really needed
* re-adding ffmpeg-nightly variant
* add ffmpeg-nightly-shared-vulkan variant
* remove build number from version check
* complete nightly variants checkversion & autoupdate
* ffmpeg-nightly: Update to version 99456
* ffmpeg: Update to version 4.3.1
* ffmpeg-nightly-shared-vulkan: Update to version 99502
* ffmpeg-nightly-shared: Update to version 99502
* ffmpeg-nightly-vulkan: Update to version 99502
* ffmpeg-nightly: Update to version 99502
* ffmpeg: Update to version 4.3.1
* ffmpeg-shared: Update to version 4.3.1
Co-authored-by: Chawye Hsu <chawyehsu@hotmail.com>