Remove geometry simplification in radiation

[reyery]

During the radiation simulation, one of the steps include simplifying the building geometries. This is done to reduce the amount of surfaces being used for the simulation, making it faster.

However, this produces some irregularities when trying to compare/align the sensor point values with the original building surfaces, especially around curved areas where vertices are close together (as seen by the screenshot below).

I propose to remove the simplification step from radiation and instead move it to zone-helper.

I believe that radiation should run based on the actual footprints of the input geometries, and not one that is produced and discarded at the end of the simulation. Therefore, it should be done at the point of importing geometries (user should be given a choice) either when fetching from OSM or importing own geometries. So the input building geometries would be the single source of truth of the building surfaces.