quickHull function
Implementation
(int count, List<Vector2> verts) quickHull(List<Vector2> verts, double tol) {
var vv = CpVectArrayRef(verts.length);
var cc = bindings.cpConvexHull(verts.length, verts.toCpVectList(), vv.toPointer, nullptr, tol);
return (cc, vv.array);
}