Lens with border and shadow

This plugin adds a lens with border/shadow to an image.
Developed with 2.8, other untested.

Usage:
- select a part from the image that you will make a lens for (use circle selection)
- make your prefered settings in the dialog
- to get a positiv look, scale image down or check that your selection is < as desired lens size so it scaled up

Not perfekt but a good first throw i guess.
I commented it well, could be usefull for other newbies. I had a hard time to figure it out.

Example: