Create client toggle for highlight vs outline

[lee0c]

There's pros and cons to both highlights and outlines. We probably want a user experience where they can be switched back and forth, and possibly customized in color (though that might happen at organization level, not user level).

[billba]

This isn't really about user or company preferences. It's about "I can't see a blue outline on this page/document that happens to be dominated by blue boxes."