Nice to have new functions

[pozzoq]

When generating polygons automatic output in the attribute table:

1. Area (kn Km^2)
2. Centroid coordinates (lat lon and/or metric)

Consider including linear elements (i.e. poly lines that are NOT contacts) into the generated .gpkg with into the attribute table:

1. length
2. coordinates of centroid (lat Lon and/or metric)
3. azimuth
4. type of linear element(?)
5. sinuosity index (i.e. shortest path from the poly line endpoints/actual path length)

Adding a basic crater count function using advanced editing QGIS functions for drawing circles
This can have an alternate "create map" button or can be "create map for crater counts" that outputs a .gpkg with:

1. circle diameter
2. circle centroid
3. area of the polygon in which are the craters
4. pre defined labels for "craters" or "secondary craters"
5. automatic extraction of formatted .diam file for craterstats (i.e. the one with area record in km^2 on top and the list of diameters)