Support for QR codes

[xispa]

Description of the issue/feature this PR addresses

This Pull Request enables QR support for senaite.impress.

To render QR, simply add the following snippet in the report template:

<div class="qrcode"
     data-size="80"
     data-color="#3a3"
     tal:attributes="data-text model/absolute_url">
</div>

where data-text contains the text to be encoded in the QR.

Current behavior before PR

No support by default for QR codes

Desired behavior after PR is merged

Support by default for QR codes

--
I confirm I have tested this PR thoroughly and coded it according to PEP8
and Plone's Python styleguide standards.

[ramonski]

Cool, thanks Jordi!
Shall we just add it to the default templates?

[xispa]

Cool, thanks Jordi! Shall we just add it to the default templates?

I did already here: https://github.com/senaite/senaite.impress/pull/146/files#diff-e3244c56ad4dad4e213ac92d12be8a61a0e3d57c7d509aec834b5735d115b44cR96-R103

[ramonski]

Cool, thanks Jordi! Shall we just add it to the default templates?

I did already here: https://github.com/senaite/senaite.impress/pull/146/files#diff-e3244c56ad4dad4e213ac92d12be8a61a0e3d57c7d509aec834b5735d115b44cR96-R103

Ah yes, I forgot that we've splitted the templates now 😅