Doccmd

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* Add a ``--sphinx-jinja2`` option to evaluate `sphinx-jinja2 <https://sphinx-jinja2.readthedocs.io/en/latest/>`_ blocks.

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* With ``--verbose``, show the command that will be run before the command is run, not after.

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* Support files which are not UTF-8 encoded.
* Support grouping code blocks with ``doccmd group[all]: start`` and ``doccmd group[all]: end`` comments.

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* Re-add support for Python 3.10.

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* Add support for Markdown (not MyST) files.
* Add support for treating groups of code blocks as one.
* Drop support for Python 3.10.

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