Class method to enable a visualization overlay of the tappable area on the ASControlNode. For app debugging purposes only. NOTE: GESTURE RECOGNIZERS, (including tap gesture recognizers on a control node) WILL NOT BE VISUALIZED!!! Overlay = translucent GREEN color, edges that are clipped by the tappable area of any parent (their bounds + hitTestSlop) in the hierarchy = DARK GREEN BORDERED EDGE, edges that are clipped by clipToBounds = YES of any parent in the hierarchy = ORANGE BORDERED EDGE (may still receive touches beyond overlay rect, but can’t be visualized).