Xcsf

Changes:
* Fix saving and loading DGP graphs from persistent storage ([151](https://github.com/xcsf-dev/xcsf/pull/151))
* Add Python tests ([149](https://github.com/xcsf-dev/xcsf/pull/149))
* Drop support for Python 3.8; Add support for Python 3.13 ([155](https://github.com/xcsf-dev/xcsf/pull/155))

Changes:
* Update Python packaging ([124](https://github.com/xcsf-dev/xcsf/pull/124))
* Add Python `validation_data` input check ([136](https://github.com/xcsf-dev/xcsf/pull/136))
* Fix sanitizer, free test memory, fix neural saving ([146](https://github.com/xcsf-dev/xcsf/pull/146))
* Update cJSON and pybind11 libs ([147](https://github.com/xcsf-dev/xcsf/pull/147))

Changes:
* Remove compilation with `-flto` ([128](https://github.com/xcsf-dev/xcsf/pull/128))

Changes:
* Improve parameter checks ([112](https://github.com/xcsf-dev/xcsf/pull/112), [#114](https://github.com/xcsf-dev/xcsf/pull/114))
* Improve hyperrectangle CSR semantics ([117](https://github.com/xcsf-dev/xcsf/pull/117))
* Fix a sampling bug in Python `fit()` when `shuffle=False` ([122](https://github.com/xcsf-dev/xcsf/pull/122))

Changes:
* Make predict function deterministic even with parallelism ([109](https://github.com/xcsf-dev/xcsf/pull/109))

Changes:
* Fix a bug serialising initial population set filename ([104](https://github.com/xcsf-dev/xcsf/pull/104))
* Add tests ([105](https://github.com/xcsf-dev/xcsf/pull/105))