code format: added script for fixing newlines around namespace blocks
namespace: added missing inet namespaces
headerguards script fixed - replace all non-alphanumeric characters to '_' in headerguards
fixed headerguards
class Address renamed to L3Address
class IAddressType renamed to IL3AddressType
class AddressResolver renamed to L3AddressResolver
inetmanet (src/routing/extras) moved to namespace inet::inetmanet
added missing inet namespaces for moduletests
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.