Compreffor

- Rebuilt _compreffor.cpp using the latest Cython 3.0.11
- Added support for Python 3.13 precompiled wheels

Dropped support for Python 3.7, added support for Python 3.12

- Use old_build_ext for Cython 3 compatibility
- Replace deprecated license_file with license_files in setup.cfg

No code changes in the main lib code.

- Regenerate .cpp files using latest Cython 0.29.32
- Build wheels for Python 3.11

Updated pre-generated cython sources in sdist to fix build issue with Python 3.11.0 beta1

Build and upload to PyPI wheels for Python 3.10, mac 'universal2' tag, linux pypy3 and aarch64 platform.
No code changes since 0.5.1.