Reference coordinate system for BaseStationary

[AhmedMzid]

The description of BaseStationary sets the reference coordinate system to be the global ground truth coordinate system, which is not available for objects in SensorData.

This is also the case for BaseMoving, Landmark, RoadMarking and TrafficSign.

[carsten-kuebler]

You are right, but not for Landmark, RoadMarking and TrafficSign. But for DetectedEntities...

[carsten-kuebler]

I add your feedback to PR #167.