Merge pull request #1016 from inthause/documents

Use Inline document for Collection Item
On context restoration in a picker, restore the selected model (if there are several models available).
Minor refactoring.
Add indent and outdent buttons in the WYSIWYG richt text editor.
Add buttons to handle lists, block quotes and code in Markdown editor
Fix tests.
Merge pull request #1017 from inthause/documents

Add new backoffice improvement
Merge pull request #1018 from intportg/dev

Richtext editor enhancements
Add new Rbs_Website_Text document and block