Equivalent missing to osgUtil::PolytopeIntersector

[TP-David]

Hi Robert, Our team has been using osgUtil::PolytopeIntersector, yet in VSG there's only vsg::LineSegmentIntersector. We chose not to use LineSegmentIntersector in OSG because it didn't catch lines or points. Would you consider creating an equivalent in VSG for polytope or can we do it ourselves?

As an example of the issue, adding state.wireframe=true to the keyPress method in IntersectionHandler (vsgintersection) does not trigger hits on newly added shapes

Thanks, David