Iterative first layer settings tester

This is a remix of a project from dgm3333.

I spent quite a lot of time trying to understand it and clean up the code, and I think it is easier to use now, however I found that it wasn't useful to me in the end.

The reason for this is that it is difficult to relate the settings selected in this program to the settings that can be selected in a normal slicer. For example when the "line width" is selected in this program, it is simply the distance between the centre of extruded lines. In prusaslicer, there is some deliberate (tune-able) overlap. It is not possible to disable the iteration of any settings, so every test must be run with at least 2x2x2x2x2 variables

I have uploaded it here in case someone else wants to try it, or improve on it. It certainly generates working G-Code, so it is useful.