* refactor some functions
* do not use mdi view of active document as parent for spin box because this can be the wrong widget
* fix compiler warnings of unused variables
* fix typo
* handle Qt::Key_Return in event filter
* fix lint error
- Allow user to position the image with a X / Y distance.
- Allow user to rotate the image on its plane.
- Adds Transparency.
- Image sizes change from PX to System unit as PX don't make sense for the user.