Implement emphasize-lines directive (#3607)

[fvicent]

Pull Request Checklist

• I’ve read the guidelines for contributing.
• I updated AUTHORS.txt and CHANGES.txt (if the change is non-trivial) and documentation (if applicable).
• I tested my changes.

Description

Add the emphasize-lines directive to code blocks, so that certain lines can be highlighted. I've borrowed almost verbatim this implementation from the Sphinx codebase.

[Kwpolska]

Thanks for contributing this feature!

[fvicent]

My pleasure! El 22/4/2022 a las 16:05, Chris Warrick escribió:

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