Flexparser

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- Nothing changed yet.

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- Fix flexparser FIPS mode.

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- export multiple symbols.
- improve typing support.

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- fix when FIPS mode enabled.
(Issue 7, thanks MattTheCuber)

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- UnexpectedEOF has been renamed UnexpectedEOS.
- Typing related improvements
- flexparser now requires Python 3.9+
- Dropped class variables for types in favour of introspecting the
generic hierarchy.

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- first public release.