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Update plotly backend to support plotly.py version 3 (#3194)

* 'k' is not a valid plotly color string, use 'black' instead
's' is not a valid plotly symbol string, use 'circle' instead
'plasma' is not a valid plotly colorscale, use 'viridis' instead

* Rename global plotly library object in JavaScript

The global plotly library object was renamed from 'Plotly' to '_Plotly'
in plotly.py 3.4.0 to avoid a naming conflict when a Jupyter Notebook
heading contained the text 'Plotly'

See:
https://github.com/plotly/plotly.py/issues/816
https://github.com/plotly/plotly.py/pull/1250

* Replace use of deprecated graph object classes

Graph objects are now structured hierarchically, so go.Marker was
deprecated in favor of go.layout.Marker.  The use of these classes
is fully optional, and they can be replaced by plain dict instances in
cases where local validation, tab completions, and docstrings aren't
needed.

* The figure.data property is now a tuple rather than a list, so it
cannot be mutated in place. Instead, the add_traces method is used
to append additional traces to the figure.

* Object arrays (like annotations) are now stored as tuples
rather than lists so they cannot be extended in place.
The += operator can be used instead to replace the object array with
an extended version of itself.

* Graph objects are no longer dict subclasses, they are wrappers around
dict instances with some dict-like methods. The to_plotly_json method
is used to convert a graph object into a Python dict.

* Update plotly in holoviews environment to version 3.4 from the plotly channel

* Validate required plotly version

* Replace deprecated append_trace method call with add_trace

* Subplot references ending in 1 (e.g. x1) now have the 1 removed (e.g. x)

* Axis ranges are now returned as tuples not lists

* Remove unused import causing flake8 failure

* When exporting to standalone html the plotly library is loaded as Plotly
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