Add Impl::toGeometryTypeConstant helper

This helper maps a dynamic GeometryType to a compile time std::integral_constant<GeometryType::Id,...>. Thus is replaces the IfGeometryType (and IfTopology) helper. In contrast to the latter it does not rely on the undocumented implementation of GeometryType::Id but on LocalGeometryTypeIndex and the generic Hybrid::switchCase helper. Furthermore the new helper uses a lambda-friendly callback interface which requires less boiler plate code for the user.

This also changes TopologyFactory to use the new interface.