Highcharts-core

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* **BUGFIX:** Fixed incorrect ``.to_json()`` serialization of ``null`` values inside of an iterable.

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* **BUGFIX:** Fixed handling of boolean values in ``GenericTypeOptions.animation`` property.
* **BUGFIX:** Fixed incorrect serialization of format strings that begin with ``{`` and end with ``}``.
In particular, now added an "escape hatch" if the ``{...}`` string is prefixed with ``$`` to ensure
proper serialization.
* **BUGFIX:** Adjusted export support for Highcharts Node Export Server v.3.1.1.

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* **BUGFIX:** Fixed incorrect handling of empty string in ``YAxis.title.text`` (171).
* **ENHANCEMENT:** Bumped dependency on ``requests`` to ``v.2.32``.

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* **BUGFIX:** Fixed data collection roundtrip via ``.to_json()`` / ``.from_json()`` (169).

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* **ENHANCEMENT:** Align the API to **Highcharts (JS) v.11.4** (163). In particular, this includes:
* Added ``Accessibility.high_contrast_mode`` support.
* Added ``OrganizationOptions.hanging_side`` support.
* Added ``SankeyOptions.node_distance`` support.
* Added ``TreegraphOptions.node_distance`` support.
* Adjusted diagram (``ArcDiagramOptions``, ``TreegraphOptions``, ``DependencyWheelOptions``, and
``SankeyOptions``) ``.node_width`` support and documentation.
* Added ``NodeOptions.height`` support.

* **ENHANCEMENT:** Added ``utility_functions.datetime64_to_datetime()`` function to convert
``numpy.datetime64`` to ``datetime.datetime`` (needed to close 162).

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* **ENHANCEMENT:** Align the API to **Highcharts (JS) v.11.3** (146). In particular, this includes:

* Added ``ChartOptions.axis_layout_runs`` property.
* Added ``ColorAxis.height`` property.
* Added ``ColorAxis.width`` property.
* Added ``Data.column_types`` property.
* Added ``Exporting.fetch_options`` property.
* Implemented support for verbose axis date-time unit labelling configuration (see: ``DateTimeLabelFormats``).


* **BUGFIX:** Added support for ``nodeFormat`` and ``nodeFormatter`` to tooltip properties for
diagram series (Organization, Dependency Wheel, and Sankey). (148)
* **ENHANCEMENT:** Added ability to remove or override the JavaScript event listener when
serializing a chart to a JavaScript literal (131 - courtesy of
`ByronCook <https://github.com/ByronCook>`__ ).
* **ENHANCEMENT:** Added support for the ``HCP_ALLOW_SPECIAL_IPS`` environment variable
which allows localhost (or other special URLs) to pass URL validation. (147)
* **DOCUMENTATION:** Fixed typos in **Getting Started** tutorial. (149)
* **DOCUMENTATION:** Fixed typos in documentation (courtesy of `karlacio <https://github.com/karlacio>`
and `maxduganknight <https://github.com/maxduganknight>`).

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