BREAKING CHANGE: Implements the saving and loading of CityObjects to a
GeoDB with in-memory caching. This allows reading of bigger CityGml
files and serves as basis for the implementation of Topological Checks.

CityDoctorModel will now return Streams instead of Lists for the
CityObject-getters (like getBuildings()). This requires a rework of all
methods calling them.

extend all polygon wrong orientation test to handle inward facing geometries
fix validation plan not written when validating in stream mode

add more information in global error table

extending visitor and add abstract visitor