Typecode

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- Upgrade skeleton
- Fix ctypes import
- Bump dependencies

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- Drop Calver
- Fix minor bugs
- Upgrade dependencies
- Adopt black style

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- Disable tracing that had been left enabled by mistake

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(yanked from PyPI)

- Update vendored pygments to 2.9.0
- Update commoncode to latest version
- Use new libmagic configuration based on a plugin, and environment variable
or the system path.
- Only do content-based detection for programing language if there is no extension.
- Remove Actionscript3 from programing language detection. This is not common
enough and is the source of too many false positives.

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- Update typecode-libmagic in particular on macOS for v11/Big Sur support

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- Update typecode-libmagic
- Drop using the standard library mimetypes modules because of
https://github.com/nexB/typecode/issues/14
- Fix testing issues and testing requirements
- Update documentation and comments
- Uupdate to use latest commoncode