Adds a new point to the points list.
Can add:
points_add(axis, value) points_add(x, y, z) points_add(x, y, z, a, b, c, u, v, w)
Add a single-axis position
points_add(0, 50); // Adds 50 to axis 0
Add an XYZ position
points_add(100, 200, 300);
Add a full 9-axis position
points_add(100, 200, 300, 10, 20, 30, 1, 2, 3);