I found this issue out on my own and then stumbled on this article while trying to understand this whitelist. This is needed for Brackets to work with AEM 6.3 (from what I can tell). You need to add aem-sightly-ide-api to the whitelist. Unfortunately, this just makes another error saying that WCMUse...

You can also take private training for AEM 6.1 or 6.2.basic - Develop Websites and Components in Adobe Experience Manager advanced - Extend and Customize Adobe Experience Manager All AEM public training courses are currently offered only on 6.3. If you take a public course, you can request an earlie...