Release Candidate v.1.7.0

[hcpchris]

• 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).

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 64.75410% with 43 lines in your changes are missing coverage. Please review.

Project coverage is 88.12%. Comparing base (92d8cb7) to head (ae06c41). Report is 56 commits behind head on develop.

Files	Patch %	Lines
highcharts_core/options/plot_options/treegraph.py	48.48%	15 Missing and 2 partials :warning:
highcharts_core/options/plot_options/sankey.py	65.62%	10 Missing and 1 partial :warning:
...ghcharts_core/options/plot_options/organization.py	57.14%	5 Missing and 1 partial :warning:
highcharts_core/utility_functions.py	28.57%	5 Missing :warning:
highcharts_core/options/plot_options/arcdiagram.py	80.00%	2 Missing :warning:
...harts_core/options/plot_options/dependencywheel.py	80.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #165 +/- ## =========================================== - Coverage 88.25% 88.12% -0.13% =========================================== Files 209 209 Lines 30472 30833 +361 Branches 2434 2484 +50 =========================================== + Hits 26892 27171 +279 - Misses 2669 2731 +62 - Partials 911 931 +20 ```

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