Update node_Script

now in and out_sockets must be enumerated by <type, name, data> so
```python
def sv_main(num_verts=20, radius=5):
 
    # in boilerplate, could be less verbose
    in_sockets = [
        ['s', 'num_verts',  num_verts],
        ['s', 'radius',  radius]
    ]
    
    # arbitrary user code
    from math import sin, cos, pi
    TWO_PI = 2*pi
    v = []
    angle = TWO_PI/num_verts
    for i in range(num_verts):
        theta = angle*i
        v.append((cos(theta)*radius, sin(theta)*radius, num_verts/10))
     
    # out boilerplate
    out_sockets = [
        ['s', 'Vecs', v]
    ]
 
    return in_sockets, out_sockets
 
if __name__ == "__main__":
    prog3 = sv_main({0},{1})
```