Poetry2conda

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Thanks to abergeron for contributing!

* 3 Fix support for dependencies that do not follow semantic version.
* 1 Fix incorrect file creation when command fails.
* Add support for `poetry extras <https://python-poetry.org/docs/pyproject/#extras>`_.
* Add option to include development dependencies.
* Add automated unit tests on github.

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* Add minimal support for extras, which are dropped on the conda environment.

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* Initial release.