Sep-pjw

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* Test against Python 3.13.
* Update the Makefile to support Semantic Versioning from git tags.
* Update the C libraries to allow for passing the version as a compiler
flag.
* Update `setup.py` to pass the SCM version to the Cython compiler.
* Include C tests in the Tox suite (for linux and macos only).
* Document any and all changes to the C API since forking.
* Restructure changelog documentation.

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* Fix wrong int type in Windows
([2](https://github.com/PJ-Watson/sep-pjw/issues/2), thanks to
acenko for pointing this out).
* Update tests to run on multiple operating systems.

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* Small fixes and updates to ensure compatibility with NumPy 2.0.

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* Include .clang-format as a pre-commit hook, to ensure consistent code
style (improved readability, easier maintenance).
* Fixed `make test` to account for the changes in
[v1.3.0](https://github.com/PJ-Watson/sep-pjw/releases/tag/v1.3.0).
* All header files include the correct definitions.

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* Add changelog to documentation.
* Add tests for re-running with seg map.
* Fix array boundary bugs when re-running with seg map.
* Fix bug with precision loss when calculating threshold.
* Improve error handling when object pixels exceed pix stack.

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* Move documentation to new location, fix package names and imports.
* Add wheels for Python 3.11/3.12.
* Fix C compilation errors on windows (VLAs).
* Publish updated version to PyPI under new name.