Update to 2.2.10
    
    - New upstream release 2.2.10
      - This is a maintenance release
      - Various fixes for newer gtk versions and for gtk on wayland (which is now
        the default on Fedora)
      - Fixes for a few rare crashes
      - Various language files have been improved, most notably languages that
        include CSS
      - New feature: ability to import/export syntax color styles; included are
        styles for a light and a dark theme