Preserve reference style Markdown links in rich text editor (RTE)

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In Markdown, reference style links are defined using [link][def] and reference definitions are defined using: [def]: https://url.

To preserve reference style links we must preserve both references and their definition.

Finally, if a reference definition is stale, it should be removed from the final markdown.

Todo:

• Preserve reference link definitions ( !161014 (merged))
• Preserve reference style links, if unchanged ( !161014 (merged))
• Preserve reference style links, even if text is changed (todo)
• Update reference definitions if a reference style link's url or title is updated
• Remove reference definition if all references links pointing to it are removed