Factor out layer selecton and MPL figure creation #125
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I started writing docs for #24, and in the process realised that third-party users might want to just have a plain napari-styled Matplotlib figure, without any of the napari layer callbacks setup.
This PR extracts the functionality for setting up the Matplotlib figure into
BaseNapariMPLWidget
, which is then inherited byNapariMPLWidget
to add the layer selection event updating bits. This doesn't change the API, but does provide a nicer separation of responsibilities between the new classes, and the new base class that could be used by third party users.