Qrbill

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- Add Arial font name in addition to Helvetica for better font fallback on some
systems.
- Drop support for Python < 3.8, and add testing for Python 3.11 and 3.12.

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- BREAKING: Removed the ``due-date`` command line argument and the ``due_date``
QRBill init kwarg, as this field is no longer in the most recent specs (84).
- Handle line breaks in additional information, so it is showing in the printed
version, but stripped from the QR data (86).
- Improved performance by deactivating debug mode in svgwrite (82).

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- Fixed a regression where the currency was not visible in the payment part
(81).

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- Replaced ` with ``//`` as separator in additional informations (75).
- Print scissors symbol on horizontal separation line when not in full page.
WARNING: the resulting bill is 1 millimiter higher to be able to show the
entire symbol (65).
- Renamed ``--extra-infos`` command line parameter to ``--additional-information``
and renamed ``extra_infos`` and ``ref_number`` ``QRBill.__init__`` arguments
to ``additional_information`` and ``reference_number``, respectively.
The old arguments are still accepted but raise a deprecation warning (68).

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- Fixed bad position of amount rect on receipt part (74).
- Increased title font size and section spacing on payment part.

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- License changed from GPL to MIT (72).
- Prevented separation line filled on some browsers.
- Scissors symbol is now an SVG path (46).