More article structure parsing and aligning sample with RS frontend

[piemonkey]

Overview

Some more parsing problems for article structure nodes (I could have sworn I fixed these already :s ).
I also changed the configuration of the editor in the editable-nodes-regulatory-statement test page to be almost the same as that on the RS frontend project.

connected issues and PRs:

lblod/ember-rdfa-editor#1139

Setup

N/A

How to test/reproduce

Construct a RS document on QA, export, then import into the RS editable node sample page and confirm the nodes are all recreated correctly.

Challenges/uncertainties

It seems there are some problems with parsing, as noted in chat.

Checks PR readiness

• UI: works on smaller screen sizes
• UI: feedback for any loading/error states
• Check if dummy app is correctly updated
• Check cancel/go-back flows
• changelog
• npm lint
• no new deprecations

[elpoelma]

Article structures mostly come over correctly from the regulatory-statements application. I did notice that copy-pasting does not work and I really have to export/import. This is probably due to another issue though.

I did notice a small mistake in the parseDOM of the structure-header-number node though.

On the issues with parsing/serializing literals with the XMLLiteral datatype. I'm not sure whether it is that much of a problem? I'll still need to take a look at your other PR on the blackbox tests.