Audplot

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* Added: support for Python 3.11
* Added: support for Python 3.12
* Fixed: avoid ``pandas`` future warning
for ``pandas.DataFrame.applymap()``
* Fixed: avoid deprecation warning
by replacing
``pkg_resources``
internally with
``importlib.metadata``
* Removed: support for Python 3.7

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* Changed: split API documentation into sub-pages
for each function

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* Fixed: x-axis scaling for ``audplot.waveform()``.
x-axis values now always correspond
to the actual number of samples
of the signal

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* Added: support for Python 3.10
* Changed: increase speed of ``audplot.waveform()``
by factor >100 for long signals

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* Fixed: require ``matplotlib!=3.6.1``
to avoid failing of ``audplot.distribution()``

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* Fixed: make ``audplot.scatter(..., fit=True)`` plots reproducible
by using a fixed seed for bootstrapping