[Feature Request] New Display Columns: Dimensions + Size Difference

[janpio]

When comparing folders with e.g. optimized images, it would be super nice if one could not only add the "File Size" columns, but also

1. the resulting "Size Difference" (calculated as the difference between the two sizes of the files) and
2. display the "Dimensions" of an image as check that the image is still the same size.

(Correct place here to suggest new features? I saw there also are issues on BitBucket, SourceForge and a forum)

[sdottaka]

Implemented by PR #996

[janpio]

Amazing @sdottaka, thank you so much!