Red Eye removal/detection

[martindahlstrom]

I'm coming across this issue in scanned material quite frequently and I think it would be a useful addition to the retouching panel.

It could be implemented as a manual picker and/or utilize some means of automatic detection.

A quick search for possibly useful reference material yielded these results:

• https://github.com/sk1210/Red-Eye-Correction (with corresponding blog post here)
• https://github.com/winniez/Red_Eye_Removal_GPU
• https://github.com/architsharma97/ImageToolbox