* set environment variables before starting QApp
* fix-422
* Better support of hidpi
* Fix Typo in App-Name
* Remove fontScaleFactor bits
* Add documenation for hidpi displays
* Fix pg not defined
* set environment variables before starting QApp
* fix-422
* Better support of hidpi
* Fix Typo in App-Name
* Remove fontScaleFactor bits
* Add documenation for hidpi displays
- optional context menu for ImageItem
- inverted y-axis in Canvas (+y now points upward)
- extra __init__ arguments for Dock
- Transform can be constructed from Matrix4x4
- many others