Hcoop-meetbot

* Refactor the run script and pre-commit hooks to reduce duplication.
* Rework the GitHub Actions build process to pull out shared code.

* Upgrade to Poetry v1.2.0 and make related build process changes.
* Upgrade to Pylint v2.15.0 and address warnings.
* Fix Pylint's configured class-attribute-naming-style to be snake_case.
* Adjust Black configuration to target Python 3.7, 3.8, 3.9, and 3.10.
* Add dependency caching to GitHub Actions workflow.
* Fix the GitHub Actions matrix build to properly target MacOS.

* Modernize usage of attrs and cattrs.

* Better handle nicks/aliases containing special characters.
* Add a suggestion at meeting start for users to identify themselves.
* Generate a raw meeting log in JSON format along with HTML logs.
* Implement a command-line tool "meetbot" and a "regenerate" utility.

* Fix a bug when an IRC nick or alias includes regex special characters.

* Adjust the pyproject.toml include directive to limit what goes into wheel.