Highcharts-core

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* **BUGFIX:** Fixed behavior where ``Chart.download_chart(format = 'svg')`` was incorrectly returning a PNG rather than an SVG ( 63 ).

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* **ENHANCEMENT:** Added autoconversion of ``plotLine.value`` from ``datetime.datetime`` to POSIX timestamp (58).
* **BUGFIX:** Fixed incorrect ``datetime`` serialization to SECONDS from Unix epoch. Now serializing to JS-compatible MILLISECONDS from Unix epoch (61).

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* **ENHANCEMENT:** Align the API to **Highcharts (JS) v.11.1** (52). In particular, this includes:

* Added ``AccessibilityPoint.description_format`` property.
* Added support for ``.legend_symbol`` to plot options and series options.
* Added ``.border_radius`` support to ``FunnelOptions`` and ``FunnelSeries``.
* Added ``.interpolation`` support to ``HeatmapOptions`` and descendents.
* Added ``.point_description_format`` support to ``SeriesOptions`` and descendents.
* Added ``.fill_space`` support to ``TreegraphOptions`` and descendents.
* Added ``.crossing`` support to axes.
* Added ``.format`` support to ``Tooltip``.

* **ENHANCEMENT:** Added support for the inclusion of scripts based on features used in the chart (12).
* **ENHANCEMENT:** Added ``dict`` support to ``.style`` property on labels and titles.
* **DOCS:** Various documentation updates and fixes.
* **DEPENDENCY:** Bumped ``requests`` version for security patch.

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* **FIXED:** Problem when producing a JS literal, with the JS code inserting an unnecessary ``new`` (42 and 43).
* **ENHANCEMENT:** Added more elegant error handling when something goes wrong displaying a chart in Jupyter (43).

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* Align the API to **Highcharts (JS) v.11**. In particular, this includes:

* Updating documentation for ``options.chart.ChartOptions.styled_mode`` to align
to new v11 design changes.
* Updated documentation for ``options.series.data.base.DataBase.color_index`` to align to
new v11 design changes.
* Added new ``utility_classes.data_labels.SunburstDataLabel`` class to patch missing
data label ``.rotation_mode`` property.
* Updated ``options.plot_options.SunburstOptions.data_labels`` to accept ``SunburstDataLabel``
values.
* Updated documentation of ``options.axes.labels.AxisLabelOptions.distance`` to reflect new (or
newly-documented) behavior.
* Added new ``utility_classes.data_labels.OrganizationDataLabel`` class to patch misisng data label ``.
link_text_path`` property.
* Updated ``options.plot_options.organization.OrganizationOptions.data_labels`` to accept ``OrganizationDataLabel``
values.
* Added ``.description_format`` property to ``options.plot_options.accessibility.TypeOptionsAccessibility``.
* Added ``PictorialOptions`` / ``PictorialSeries`` series type with related classes.
* Added ``.minor_ticks_per_major`` to ``options.axes.x_axis.XAxisOptions``.
* Added ``.stack_shadow`` to ``options.axes.y_axis.YAxisOptions``.
* Added ``.border_radius`` to ``ColumnRangeOptions`` / ``ColumnRangeSeries``.
* Added ``.play_as_sand`` and ``.download_midi`` to ``global_options.language.Language``.
* Added ``.border_radius`` to ``PieOptions`` / ``PieSeries``.
* Added ``.style`` to ``utility_classes.buttons.CollapseButtonConfiguration``.
* Added ``utility_classes.events.SimulationEvents`` and modified ``NetworkGraphOptions`` to support.
* Added ``options.sonification`` and all related classes.
* Added series-level ``SeriesSonification`` to all series.

* **FIXED:** Broken heatmap and tilemap documentation links.
* **FIXED:** Fixed missing ``TreegraphOptions`` / ``TreegraphSeries`` series type.

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* **DOCUMENTATION:** Added documentation of hard dependencies to the README (issue 37).

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