Products.mimetools

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- Fix insidious buildout configuration bug for tests against Zope 4.

- Add support for Python 3.10 and 3.11.

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- Add support for Python 3.9.

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- Fix linting.

- Change some imports to prevent DeprecationWarnings.

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- Reimplemented using Python's ``email`` module.

- Added support for Python 3.5, 3.6, 3.7 and 3.8.

- Switched documentation to standard ``dtml`` notation.

- Added ``tox`` testing configuration.

- Full linting.

- Boosted test coverage to over 90%.

- Compatible with DocumentTemplate 3.x and Zope 4.

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- PEP8 cleanup and added basic tests.

- Released as separate package.