Create an automatic requirements installation system

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Pip checking:
http://blog.backslasher.net/pip-dry-run.html

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https://togithub.com/pypa/packaging-problems/issues/664

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Consider using https://github.com/astral-sh/uv to do all of the resolving.
Sadly, they are not providing APIs and they have no plans to change that.
Uv would need te be vendored in, and called a subprocess, if we'd decide to use that tool.