Create AreaDensityCountingProcessor

Motivation: I need to count pedestrians in an measurement area.

As far as I can tell, there is no processor which provides this. The closest is the AreaDensityVoronoiProcessor, however, it

At the moment, I workaround by changing the , which counts people in an area of Shape but also divides by the sum of areas of Voronoi Faces.

xref #123

Edited May 14, 2019 by Daniel Lehmberg

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