Rework Ffmpeg

[spartacus04]

• Ditch the ffmpeg-sidecar crate
  • Write a downloader for eugeneware/ffmpeg-static (both ffmpeg and ffprobe)
  • Write a little wrapper for Ffmpeg
  • Implement the wrapper in place of ffmpeg-sidecar
• Write a wrapper for Ffprobe
  • Add a tauri ffprobe command to parse data
  • Check if an audio file is already vorbis/opus
  • Extract data from audio files for disc titles, authors, etc