Caen-felib

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Changes:
- Examples moved to examples folder.

New features:
- Update `[project.urls]` on pyproject.tolm, with new public repositories
on github.com.

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New features:
- New file types, that includes enumerators to help decoding
DPP-PHA and DPP-PSD error flags and probe types from events,
available in dig1_types and dig2_types submodules.
- Tentative support of PTRDIFF_T data type.

Fixes:
- Refactoring wrapper to binding, that is more appropriate.
- Fix typing of set_read_data_format.
- Doc improved.

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Fixes:
- Added py.typed file to instruct mypy to use type annotations.

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Fixes:
- Fix requires-python in pyproject.tolm

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New features:
- Typing improved
- Dropped support for Python 3.7
- Requiring numpy >= 1.20

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New features:
- Add support for CAEN_FELib_GetImplLibVersion
- Improved example in README, implementing an acquisition loop
- ErrorCode now inherits from IntEnum to simplify conversion to integers