Contourpy

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This release adds type annotations and moves project metadata to pyproject.toml (PEP 621).
Documentation now uses the Sphinx Furo theme, supporting dark and light modes. There are no
functional changes.

Type annotations:

* Add type annotations (:pr:`199`, :pr:`200`, :pr:`201`, :pr:`202`)
* Complete mypy configuration (:pr:`206`)

Documentation improvements:

* Support dark mode (:pr:`185`, :pr:`188`)
* Use sphinx copy button (:pr:`189`)
* Add conda monthly download badges to README (:pr:`192`)
* Furo sphinx theme (:pr:`195`)

Code improvements:

* Improved if statement (:pr:`186`)
* Test nonfinite z and decreasing zlevel for filled (:pr:`190`)
* Add abstract base class Renderer (:pr:`198`)
* Replace mpl scatter call with plot instead (:pr:`203`)
* Use absolute imports (:pr:`204`)
* Minor improvement to get_boundary_start_point (:pr:`205`)

Build system and CI improvements:

* Switch from setup.cfg to pyproject.toml (:pr:`181`)
* Add git pre-commit (:pr:`191`)
* Test improvements (:pr:`193`, :pr:`194`, :pr:`197`)
* CI improvements (:pr:`179`, :pr:`180`, :pr:`184`)

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This release features major improvements to the robustness of the threaded algorithm on both
CPython and PyPy.

Thanks to new contributors :user:`mgorny` and :user:`Zac-HD`.

Threaded algorithm improvements:

* Correctly acquire and release GIL in multithreaded code (:pr:`172`)
* Update benchmarks in line with recent changes (:pr:`174`)

CI improvements:

* Add PyPy 3.9 to CI (:pr:`173`)
* Use numpy debug build in debug CI run (:pr:`175`)

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This release includes performance improvements for threaded and serial chunked algorithms, and is
the first release to support CPython 3.11.

Performance improvements:

* Shorter threaded lock (:pr:`154`)
* Init cache by chunk if more than 1 chunk (:pr:`155`)
* Update benchmark documentation and plots (:pr:`156`)

CPython 3.11 support:

* Add python 3.11 release candidate to CI (:pr:`151`)
* Build CPython 3.11 wheels (:pr:`152`)

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This release puts all C++ code within a namespace to avoid symbol conflicts such as on IBM AIX.

* Add namespace (:pr:`144`)
* Allow install of test dependencies without codebase deps (:pr:`147`)

-------------------

* Remove unnecessary code duplication (:pr:`130`)
* ContourGenerator base class (:pr:`131`)
* Mark tests that need mpl (:pr:`133`)
* Fix for PyPy np.resize bug (:pr:`135`)
* Initialise mpl backend when first needed (:pr:`137`)
* Add isort to pytest (:pr:`138`)

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* Add tests that do not write text to images (:pr:`124`)