[#169] Update ckeditor
We should update ckeditor4 to 4.18.0 due to XSS Vulnerabilities, however the change includes bumping ckeditor4-react from 1.4.x to 3.x which is not trivial.
Changes include droping data
param and start using editor.setData
and hooks to manage the state.
https://github.com/ckeditor/ckeditor4/blob/master/CHANGES.md#ckeditor-4180 \
https://github.com/ckeditor/ckeditor4-react/blob/master/CHANGELOG.md