Feature proposals: Add some visual options

[rgendroz]

It would be nice to have some visual options to custom and improve the visual rendering of the QR,
per example:

• font Frutiger
• cutting lines style
• default cutting text above QR-Bill with triangular images
• adding scissors

I implemented these options (except font) with the fpdf library to replace the default line and text, but It would be great to update master branch with such options, and allowed to change the default font without causing updates problems. It would be with pleasure if I modestly could contribute to these improvements, don't hesitate to contact me.

image

With regards, Raoul

[sprain]

• adding scissors -> see Feature proposal: Add scissors symbol #180

Pull requests for such features would be accepted, if anybody wants to provide them. It could be a good idea to discuss the approach first before spending too much time in implementation.