Crystalline Phase Mapping

Thanks for this amazing piece of software!

Is your feature request related to a problem? Please describe.
The original py4DSTEM paper shows a very nice crystal phase map, but the execution is not well described there.

Describe the solution you'd like
I would like the code necessary to generate such phase map given a sample which has single crystalline and powder regions combined.

Describe alternatives you've considered
I am right now considering to use the classification method for the twinned crystal using voronoi tesellation, but I am not sure how to chose Qx and Qy for the voronoi in this case (with powder rings included).

I have developed a circular voronoi tesellation, but then I realize that in order to initialize th BraggVectorClassification class, the data has to be given as PointListArray instead of PointList. The only PointListArray I can extract from my braggpeaks PointList is braggpeaks._v_uncal, but of course this is uncalibrated...

Additional context
I attach my calibrated BraggVectorMap to show the combination of powder and crystal regions.

Start by reviewing BraggVectorClassification and the PointListArray versus PointList inputs, including the calibrated BraggVectorMap and braggpeaks._v_uncal mentioned in the issue. Done should provide a documented way to generate a crystal phase map from combined single-crystal and powder regions while preserving calibrated data.