Fix schemaeditor

[frapell]

Fix adding fields to fieldsets, and drag and drops between fieldsets.

Prevent adding fields to fieldsets from behaviors.

fixes gh-1201

[frapell]

This needs plone/plone.schemaeditor#92

[frapell]

@petschki @thet You guys want to give it a try?

Btw, I am preventing adding and drag&drop fields to fieldsets added from behaviors, since I don't think that was ever intended... At least I am not finding a proper way to do it...

You will need to use the mentioned branch from plone/plone.schemaeditor#92

[frapell]

@thet Do I need to do anything to the changelog? I was under the impression that it was automatically generated out of the commits when they include parts like fix(pat schemaeditor) right?

[petschki]

Nothing to do in changelog since your commit message fits the release-it conventional changelog ...

I suggest to do the following:
Create a PR in plone.staticresources with the latest commit hash here as mockup dependency in package.json and Test it together with the schemaeditor PR in Jenkins.

Don't forget to run make all in staticresources when changing dependencies.

[petschki]

LGTM