ENH: Axis labels show which curves are on the axis #1099
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This builds on #1097, because it requires the use of the _curves attribute added to BasePlotAxisItems in that PR.
Given that each axis can have many curves on it, and you can freely move curves around, it can be confusing which curves are attached to which axes. As such, users will want to see which curves are attached to which axes.
Every time a curve is linked, unlinked, or its name changes, we are calling autoVisible to make sure the axis should or should not be shown. As a subroutine, we edit the label to include the names of the curves attached to this axis. If it is to be shown, the label will be updated; if not, it will remain hidden anyway.