V2.2.1 released

After quite a long time, here's the update to Admin4. It fixes several annoying issues:

- The About Dialog on Windows is less ugly now
- Online update improved, restart should work now (finally...)

- improved connection statistics

- SQUAT support

V2.2.0 had the restart-after-update feature removed right before release. Unfortunately, that Admin4 version won't give feedback when the update has been successfully applied. Please press "Cancel" after a while, restart Admin4 and check if it has been updated correctly.

Enjoy and provide feedback!