spokes.icn: Program to draw spokes design

This program draws "spokes" patterns.

The following options are supported:

     -g      run continuously; ignore user events; default: process user
               events
     -l i    limit on number of iterations, default 2 ^ 10
     -n i    maximum number of spokes, default 50
     -s i    size of window (width/height); default 256