fix: syntax error in setup.py + modernize #237
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Fixes the syntax error, cythonizes dynamically (may make this run on more platforms), sets language level to 3 (Python 2 is EOL for years now) to remove a warning, and adds license and classifiers so PyPI can categorize it better.
Loads numpy dynamically so it won't crash if numpy was installed at the same time as the setup call is run.
Uses numpy for installation, but oldest-supported-numpy for isolated compilation for py38 via pyproject.toml
Adds MANIFEST.in to ensure sdist includes source files, LICENSE, etc.
Resolves #233
This was moved from #236