Changes to message objects on the way to support WYSIWYG

Changes to message objects on the way to support WYSIWYG

This autumn or soon thereafter, users will begin editing messages using a <strong>WYSIWYG</strong> (<em>what you see is what you get</em>) interface. When they do, their posted messages will appear slightly different throughout our APIs. <a href="/changelog/2019-09-what-they-see-is-what-you-get-and-more-and-less">Learn more</a>.

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