Feature Request-Crop UI free-form perspective correction

[fjdemos]

Is your feature request related to a problem? Please describe. The deskew feature is good but it only works for rectangle shaped scan. There are scenarios where scanned pages are not rectangular shaped, e.g. torn/crooked pages.

Describe the solution you'd like Allow manual perspective correction in the crop UI interface so we can mark 4 corners (not necessarily in a perfect rectangular shape) and the image should be straightened.

Describe alternatives you've considered I had to resolve to gimp to perform perspective correction or use mobile apps such as genius scan/camscanner then import the fixed images in to NAPS2. If perspective correction can be performed directly in NAPS2, it would simplify the workflow.