Handle block deserializers in control panels

[JeffersonBledsoe]

Fixes #1868

[mister-roboto]

@JeffersonBledsoe thanks for creating this Pull Request and helping to improve Plone!

TL;DR: Finish pushing changes, pass all other checks, then paste a comment:

@jenkins-plone-org please run jobs

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass, but it takes 30-60 min. Other CI checks are usually much faster and the Plone Jenkins resources are limited, so when done pushing changes and all other checks pass either start all Jenkins PR jobs yourself, or simply add the comment above in this PR to start all the jobs automatically.

Happy hacking!

[davisagli]

@JeffersonBledsoe It looks plausible to me, but I'd really like to see a test confirming that the resolveuid transforms are applied. Also don't we probably need something similar for the serializer?

[JeffersonBledsoe]

@JeffersonBledsoe It looks plausible to me, but I'd really like to see a test confirming that the resolveuid transforms are applied. Also don't we probably need something similar for the serializer?

Yep, I'll get round to those soon hopefully! The current status is what was needed for a project, I'll add the tests and the serializer part of the story soon