Clustering of buildings

[StanleyRisch]

To reduce the numbers of buildings we want to cluster them geographically. @marcusfuchs already implemented this in another repo. I will look at his implementation and integrate a function in uesgraphs.

[JSchiefelbein]

Sound familiar. You might want to take a look at: https://github.com/RWTH-EBC/pyCity_calc/tree/master/pycity_calc/toolbox/clustering or talk with @jsc-tbe . There are different methods to cluster buildings into groups, e.g. based on local proximity.