screenkey 1.4

- Internationalization/catalog handling during installation is now
  handled with Babel (``python-distutils-extra`` is no longer used).
- Improved highlighting of recent mouse activity (makes fast actions
  such as double-click more distinct).
- Fixed another resizing issue not working properly when attempting
  to shrink the window size.
- Removed Python 2 remains (thanks to Jürgen Gmach).