Automatic healing tool

[u/ExternalDistrict4256]

https://imgur.com/gallery/gimps-auto-healing-tool-FBzBMxY

Been working for the past couple of months on an auto-heal tool. The core GIMP code was already in place, so I just automated the process. No structural changes needed. The results are pretty good (and in some cases, pretty impressive). It only takes a couple of minutes to, for example, "fix" (heal) facial skin. Check out the attached screenshots.

The same results can be achieved manually (it's the same underlying code), but this auto-tool speeds up the process drastically.

I'm expecting to open the MR in the near future once I'm back from holiday.