Reactive navigation classes

// structs

struct mrpt::nav::TCandidateMovementPTG;
struct mrpt::nav::TRobotShape;
struct mrpt::nav::TWaypoint;
struct mrpt::nav::TWaypointSequence;
struct mrpt::nav::TWaypointStatus;
struct mrpt::nav::TWaypointStatusSequence;

// classes

class mrpt::nav::CAbstractNavigator;
class mrpt::nav::CAbstractPTGBasedReactive;
class mrpt::nav::CLogFileRecord;
class mrpt::nav::CMultiObjMotionOpt_Scalarization;
class mrpt::nav::CMultiObjectiveMotionOptimizerBase;
class mrpt::nav::CReactiveNavigationSystem;
class mrpt::nav::CReactiveNavigationSystem3D;
class mrpt::nav::CRobot2NavInterface;
class mrpt::nav::CRobot2NavInterfaceForSimulator_DiffDriven;
class mrpt::nav::CRobot2NavInterfaceForSimulator_Holo;
class mrpt::nav::CWaypointsNavigator;