QR codes for interactive programs

[ascholerChemeketa]

This adds QR code generation for interactive programs (activecode/codelens).

Because programs already may have width issues in print, I don't want to do the link side by side with the program itself. So instead, an assemblage with a link/qr is added after the program. I think it is good to have that block visually separated as a "here is something not part of the core text". But I feel no real ownership of that layout.

I figure you will want to do your own test of generation, so no commit with the updated QR codes.

First commit fixes a breaking bug if version 8+ of qrcode is installed:
https://pypi.org/project/qrcode/
If the rest of this ends up languishing, it might be worth breaking that commit out.

[ascholerChemeketa]

BTW - I hate that the url needs to go in a p and thus gets indented. Not sure how to avoid that though.

[ascholerChemeketa]

Draft while working on:
#2682

[ascholerChemeketa]

Updated based on results of <pi:localize> work.

Content since last review:

• Individual xml sidecar files for urls
• Use pi:localize
• Dropped commit moving static-url templates from -assembly to -html (see below)

I kept the extraction-wrapper override in extract-qrcode as it is the best way to have a single decision based on $baseurl to either generates error message or do work.

I believe dataurl is the now the only thing that still relies on "static-url" templates during static build. So moving the "static-url" templates needs to wait on a solution for it.