BuildingLayer: Support extrusions in Mapzen Layer #419
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This is a first approach of support for extrusions in other layers than OscimMap4 in VTM. Therefore a unification of tags is necessary and support of S3DB tags in mapsforge maps. I reorganized some code, but only for clarity. There are some hardcoded calculations on height for mapzen layer, because this tag is derived from the area and volume (usually for building_parts). Criticism is welcome ;D