Make qrcode library produce SVG images instead of PNG

[johannaengland]

We might want to consider an option to produce SVG images, if possible from the qrcode library - in which case we wouldn't need to bother with deciding the physical dimensions (and therefore, storage requirements) of the resulting graphic.

Originally posted by @lunkwill42 in #2887 (comment)

[johannaengland]

Potential reference: https://ourcodeworld.com/articles/read/554/how-to-create-a-qr-code-image-or-svg-in-python

[johannaengland]

In the last reference group meeting it was decided to offer the option for both SVG and PNG and to have a check before or a setting that switches between these.