sphinx-reload

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The import sphinx_reload in setup.py causes several problems:

1. Each install requirement of sphinx_reload becomes a build requirement as well; when I do pip install -e . for example, I'm hit with a ModuleNotFoundError on the third-party import statements in sphinx_reload.py: import livereload
2. The sphinx_reload module isn't necesarily available on the path, or it might discover another installed sphinx_reload, messing with the __version__ detection.

This PR adresses these issues by instead scanning the module line by line for a __version__ declaration, and evaluates the right hand side of the assignment statement, without importing it (1) and always finding the same file relative to setup.py (2)