• Major API overhaul and API version bump, detailing all the changes
  would be ridiculous and hence won't be done.
  
• Run Libretro cores isolated in a dedicated subprocess, similarly to
  how modern web browsers handle web pages.
  
• Support Libretro cores rendering their video with OpenGL.
  
• Improve the Libretro core timing accuracy.
  
• Resample the Libretro core's audio output to ensure it matches its
  play speed.
  
• Publish the nightly reference manual at
  https://gnome.pages.gitlab.gnome.org/retro-gtk/.