Rotate a vector around another point.
CL_Vec2<double >& CL_Vec2< double >::rotate( const CL_Vec2 < double > & hotspot, const CL_Angle & angle); static CL_Vec2<double > CL_Vec2< double >::rotate( const CL_Vec2 < double > & vector, const CL_Vec2 < double > & hotspot, const CL_Angle & angle);