A TimeCostFunction which reduces the travelling speed decreases with the pedestrian density.
At the moment the code to dynamically refine the mesh is disabled
(compare the unused method TimeCostGaussianPedestrianDensityMesh#refineMesh).
Enabling the dynamic refinement is experimental code! It is not clear how often one should refine
and how large the refinement cutoff should be used.
@param
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