Environment: Added parsing for shapes and materials.
Radio: Added obstacle examples.
Radio: Moved neighbor cache files to a separate folder.
Mobility: Added movement trail.
Radio: Fixed communication trail.
Radio: Fixed copy-pasted license.
Environment: Added simple view angle for objects.
Geometry: Completed line segment sphere intersection.
Geometry: Changed intersection API.

Added NIL and unspecified to Coord and LineSegment.
Radio: Added reflection loss computation to ObstacleLoss.
Geometry: Added intersection normal vector.
Radio: Added obstacle intersection trail.
Geometry: Added normal vector for sphere intersection.
Radio: Added face normal vectors to obstacle intersection trail.