Joseph Black

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The shaders included in this PR are imported from #3860. For the fastest progress on the new feature, at least initially I've structured the shader switching mechanism to read `Preview.frag`...

The GSoC 2022 work is now consolidated in #4330

See the [comment](https://github.com/openscad/openscad/pull/4305#issuecomment-1197471289) on an old PR about attribution for the original versions of certain example shaders included here.

This PR is used as a historical record of my work for Google Summer of Code 2022. Therefore, I have restored its original commits over kintel's rebase (which is preserved...