- The current style and color handling in ExoIconBar isn't optimal and kinda
  hacky after all. We've to replace that with a better implementation one
  day.
- Finish the Python bindings.

- The MIME cache module in the xdgmime implementation must be fixed to work
  properly, esp. in cases where the MIME cache contains broken entries where
  the MIME type is 0 characters long.
- The content sniffer in both the non-cached and the cached version must be
  changed to checks the contents for text/plain if application/octect-stream
  is guessed.
