Qrcode

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- Add Styled PIL image factory, allowing different color masks and shapes in QR codes

- Small performance inprovement

- Add check for border size parameter

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- Add --ascii parameter to command line interface allowing to output ascii when stdout is piped

- Add --output parameter to command line interface to specify output file

- Accept RGB tuples in fill_color and back_color

- Add to_string method to SVG images

- Replace inline styles with SVG attributes to avoid CSP issues

- Add Python3.10 to supported versions

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- Drop Python < 3.6 support.

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- Fix short chunks of data not being optimized to the correct mode.

- Tests fixed for Python 3

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- Fix optimize length being ignored in ``QRCode.add_data``.

- Better calculation of the best mask pattern and related optimizations. Big
thanks to cryptogun!

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* Fix incomplete block table for QR version 15. Thanks Rodrigo Queiro for the
report and Jacob Welsh for the investigation and fix.

* Avoid unnecessary dependency for non MS platforms, thanks to Noah Vesely.

* Make ``BaseImage.get_image()`` actually work.