F# version of spinning ASCII torus
For details (coments), see:
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Rust version: https://github.com/HidekiAI/ascii_torust
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Original writeup in C (by Andy Sloane): https://www.a1k0n.net/2011/07/20/donut-math.html
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^Chidekiai@shuriken ~/projects/ascii_torus_fsharp $