Add import/edit wizard

[Varbin]

Write an import/edit wizard for imported images.

It should support more complex scenarios, such as:

• Allow the user to select images from a PDF Add PDF import #5
• Allow the user to select the document out of the picture Handle importing both images in one go #10
• Correct distortion - as feature detections is a bit more complex, maybe allow the user to select the corners Automatically detect and rotate tilted Ausweis #19

[Varbin]

A progress report: