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