Highcharts-core

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* **BUGFIX:** Fixed incorrect ``style`` property deserialization in certain places (82).

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* **ENHANCEMENT:** Modified the way that data points are serialized to JavaScript literal objects. Now, they are serialized to a JavaScript array if their configured properties are those that Highcharts (JS) supports in JavaScript array notation. Otherwise, the code falls back to serialize the data point as a JavaScript object literal. This change is intended to improve performance and reduce the size of the serialized data. (77)
* **ENHANCEMENT:** Added ``__repr__()`` method for Highcharts Core for Python classes (76).
* **ENHANCEMENT:** Added ``__str__()`` method with special handling for difficult-to-read classes (76).
* **ENHANCEMENT:** Added ``Chart.get_script_tags()`` to retrieve Javascript ``<script>`` tags (78).
* **ENHANCEMENT:** Added ``utility_functions.to_snake_case()`` function.
* **BUGFIX:** Fixed incorrect serialization of datetime and Pandas ``Timestamp`` objects in ``.to_dict()`` and ``.to_json()`` (74).
* **BUGFIX:** Fixed incorrect serialization of ``EnforcedNull`` in ``.to_dict()`` and ``.to_json()`` (75).

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* **BUGFIX:** Fixed incorrect handling of an empty string in ``Annotation.draggable`` property (71).

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* **BUGFIX:** Fixed ``ExportServer`` handling of data relying on Pandas ``Timestamp`` instances.

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* **BUGFIX:** Fixed ``.from_array()`` de-serialization to support propagation of string-type ``x`` values to ``name``(67).

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* **BUGFIX:** Fixed error when loading certain Highcharts (JS) scripts in Jupyter context.
* **ENHANCEMENT:** Increased the default timeout for ``Chart.download_chart()`` and related.

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