Add a feature to update yt-dlp-gui and its dependencies #70
Description
Currently, yt-dlp-gui *only* downloads the yt-dlp and ffprobe binaries when it was launched for the first time after installation, and you have to update the binaries in the "bin" folder manually with multiple methods that differ by binary.
There should be a feature that checks for and downloads updates for yt-dlp-gui itself and its dependencies (yt-dlp and FFmpeg binaries).
yt-dlp's update scheme should be able to select release channels (there are three release channels for the yt-dlp binary: stable (default), nightly (recommended for regular users), and master (which has releases that are built after each push to yt-dlp's master branch). Details on https://github.com/yt-dlp/yt-dlp?tab=readme-ov-file#update ).
The FFmpeg binaries should use the custom builds made by yt-dlp for smooth integration.