• New user interface! Besides a more modern appearance, it has better
  error handling and an experimental live view UI.
• Compile fix for nightly rust 2021-03-14 and beyond.
• Fix incorrect prev_media_duration_90k calculation. No current impact.
  This field is intended to be used in an upcoming scrub bar UI, and when
  not calculated properly there might be unexpected gaps or overlaps in
  playback.