lang: Adding Oz programming language

[luxluth]

No description provided.

[o2sh]

Lovely design, @luxluth! Thanks for your contribution! Before merging it, we'll need to clean it up a bit to make it look less noisy and more symmetrical.

I don't have much time these days. Please feel free to give it a try. Below, you'll find some building blocks to help you.

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      zz
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      zzz

[luxluth]

I think it's cleanner now

[spenserblack]

It looks like #1305 is moving forward, so, if you're interested, we'd appreciate your help in spenserblack/gengo#34 🙂