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I want to add a token, COMPLETEUSERNAME, which is made up of prefix, firstname, middlename, lastname, optional comma, and suffix.
Is this as simple as constructing the thing and adding it as another case in TemplateEngine.cs?
Yes, just add it to the switch statement. TemplateEngine is the base class that is used by all template views if the token is not found in the top class (e.g the Profile Main view would check all it's tokens then look in the base class if it did not find it, so TemplateEngine is the right place for it.