Prestools

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* Add ``plot_confusion_matrix`` to ``prestools.graph``;
* Add related tests;
* Drop support for Python < 3.6;
* Update requirements;
* Update documentation.

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* Add ``rpkm`` and ``quantile_norm`` functions to ``prestools.bioinf``;
* Add ``reduce_xaxis_ticks`` and ``reduce_yaxis_ticks`` functions to ``prestools.graph``;
* Move ``flatten_image`` to ``prestools.graph``;
* Remove ``prestools.learn``;
* Update related tests;
* Fix documentation and API.

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* Add ``learn`` module and related tests;
* Remove ``random_image`` from ``graph`` module;
* Clean code.

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* Add short version arguments to ``reverse_complement`` bioinf function.

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* Add ``apply_parallel`` function to ``prestools.misc``.

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* Fix docstrings and type hints;
* Update documentation.