Community Faves for g'mic-qt

A lot of us already use Faves for storing filter parameters. When I looked to see how I can get around the issue of not being able to add some of my custom alternating formulas into premade formula as it is out of scope of the filter, I ended up thinking about that maybe we should be able to share our “Faves” parameter as a new group of filters in G’MIC. This would enable easier cooperation on filter as people would be able to share their fave parameter.