Common: Added TrailLayer.
Geometry: Cosmetics.
Environment: Cleaned up computeCanvasPoint.
Environment: Added min/max/center position kinds and line color to physical objects.
Mobility: Fixed RectangleMobility z position.
Environment: Added prism shape.
Environment: Removed obsolete Obstacle, ObstacleControl and AnnotationManager.

Replaced by
Shape/Cuboid/Sphere/Prism...
PhysicalEnvironment/PhysicalObject/Material
IObstacleLoss/ObstacleLoss
Example: Updated obstacle example.
Radio: Added communication display to radio medium.