Adding a WYSIWYG markdown editor

[bzlister]

super_editor is this close to acheiving a WYSIWYG markdown editor - currently, super_editor_markdown exposes a way to render a string of markdown text into a MutableDocument, which then can be used with a DocumentEditor to make a SuperEditor. You can insert new plain text, or edit the text within the existing Markdown syntax, but you cannot add new Markdown syntax.

Are there any plans for this? If not, I would appreciate some advice on getting started on this myself - from reading source code I think I need to find where the raw text is parsed into a List<DocumentNode>, and edit it to instead generate the List from _MarkdownToDocument as is done in deserializeMarkdownToDocument