Added plot style context managers to all plot methods

[Tom-Kingstone]

NOTE: Depends on

Issues addressed by this PR

Closes #204
Closes #207

This removes the need to globally set plot style in dependent packages (see this PR for example), and allows setting it dynamically on method call using the kwarg "style_context". By default all the plot methods will use "python_toolkit.bhom" as the plot style, but this can be overridden by passing "default" to instead use whatever default matplotlib has currently set.

Moved the mplstyle files to the root of the package just to allow easy selection in code (allows passing "python_toolkit.bhom" instead of the path to the .mplstyle file)

Also added a dark theme (much to the benefit of my eyes on dark backgrounds) called bhom_dark.

This only works for matplotlib based plots, so plotly plots (like parallel_coordinate_plot) do not allow this.

Also @Felix-Mallinder bug fixes from #207

Test files

Run the unit tests and ensure they pass, see it in action by using any of the matplotlib based plot methods (eg. heatmap) and passing style_context="python_toolkit.bhom" to the method.

Changelog

• Added more flexible style selection through the style_context kwarg for all matplotlib plot methods
• Added bhom_dark matplotlib style sheet.

Additional comments

packages that depend on python_toolkit must change any references to the python_toolkit/bhom/bhom.mplstyle file to python_toolkit/bhom.mplstyle or more cleanly with matplotlib, use "python_toolkit.bhom"

[Tom-Kingstone]

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@Tom-Kingstone just to let you know, I have provided a check-installer result to this Pull Request as it was detected to be linked to other Pull Requests in a series. The comment which triggered this check came from @Tom-Kingstone on LadybugTools_Toolkit

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[jamesramsden-bh]

Have tested with run_tests.bat and a manual spot check, happy to merge

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