Major maintenance update:
* merge of three major forks: `pykalman` package, `pykalman-bardo`, `sktime.pykalman`
* compatibility with `numpy 2`
* support and testing for windows, macOS and linux
* testing for python 3.9-3.13
Maintenance
- [MNT] merge of `sktime` fork into `pykalman` - `numpy 2` compatibility, documentation, test refactor ([120](https://github.com/pykalman/pykalman/pull/120)) [fkiraly](https://github.com/fkiraly)
- [MNT] Clean-up of `pyproject.toml` ([130](https://github.com/pykalman/pykalman/pull/130)) [phoeenniixx](https://github.com/phoeenniixx)
- [MNT] CI element for programmatic check of missing `__init__` files ([131](https://github.com/pykalman/pykalman/pull/131)) [phoeenniixx](https://github.com/phoeenniixx)
- [MNT] fix `pykalman` logo in `README.md` ([134](https://github.com/pykalman/pykalman/pull/134)) [fkiraly](https://github.com/fkiraly)
- [MNT] adding CI test matrix ([127](https://github.com/pykalman/pykalman/pull/127)) [phoeenniixx](https://github.com/phoeenniixx)
- [MNT] temporarily remove missing init file check ([125](https://github.com/pykalman/pykalman/pull/125)) [fkiraly](https://github.com/fkiraly)
- [MNT] Move the metadata into PEP-621-compliant pyproject.toml ([124](https://github.com/pykalman/pykalman/pull/124)) [KOLANICH](https://github.com/KOLANICH)
- [MNT] python 3.11 compatibility - replace deprecated inspect.getargspec ([107](https://github.com/pykalman/pykalman/pull/107)), ([#101](https://github.com/pykalman/pykalman/pull/101)), ([#63](https://github.com/pykalman/pykalman/pull/63)) [doberbauer](https://github.com/doberbauer), [erkinsahin](https://github.com/erkinsahin), [jonathanng](https://github.com/jonathanng)
- [MNT] add all-contributors file ([123](https://github.com/pykalman/pykalman/pull/123)) [fkiraly](https://github.com/fkiraly)
- [MNT] Added pre-commit Hooks for code-quality checks ([117](https://github.com/pykalman/pykalman/pull/117)) [phoeenniixx](https://github.com/phoeenniixx)
Documentation
- [DOC] `pykalman` logo with name ([136](https://github.com/pykalman/pykalman/pull/136)) [fkiraly](https://github.com/fkiraly)
- [DOC] Update `README.md `([132](https://github.com/pykalman/pykalman/pull/132)) [phoeenniixx](https://github.com/phoeenniixx)
- [DOC] improved formatting of readme preamble, new pykalman logo ([133](https://github.com/pykalman/pykalman/pull/133)) [fkiraly](https://github.com/fkiraly)
- [DOC] Fix notation wrt observation offsets ([70](https://github.com/pykalman/pykalman/pull/70)) [dslaw](https://github.com/dslaw)
- [DOC] fix simple typo, probabily -> probably ([96](https://github.com/pykalman/pykalman/pull/96)) [timgates42](https://github.com/timgates42)
Fixes
- [BUG] Fixed variable and argument names `_em_observation_covariance` ([69](https://github.com/pykalman/pykalman/pull/69)) [oseiskar](https://github.com/oseiskar)
Contributors
[doberbauer](https://github.com/doberbauer), [dslaw](https://github.com/dslaw), [erkinsahin](https://github.com/erkinsahin), [fkiraly](https://github.com/fkiraly), [jonathanng](https://github.com/jonathanng), [KOLANICH](https://github.com/KOLANICH), [oseiskar](https://github.com/oseiskar), [phoeenniixx](https://github.com/phoeenniixx), [timgates42](https://github.com/timgates42)