title: How do you get the UIKit coordinates of an ARKit feature point?
body: <p>I have an ARSCNView and I am tracking feature points in the scene. How would I get the 2D coordinates of the feature points (as in the coordinates of that point in the screen) from the 3D world coordinates of the feature point? </p>
  
  <p>(Essentially the opposite of sceneView.hitTest)</p>