v0.23.10: 0.23.10: oxframe 0.23.10, editor 0.1.7 (#49)

• Creates projects on oxframe 0.23.10, which fixes crackling speech in a
  render with several jobs (the TTS cache was written by every job at once).
• Editor 0.1.7: reloading the page while the video played no longer leaves
  it running behind a ▶ with no sound; a reload starts from the beginning,
  and so does a rebuild, at most every 15 s; a play/pause button in the
  middle of the frame.