Migrate front-end editor components to CoralUI 3 and remove dependency on CoralUI 2
From v1.5.0, AEM 6.2 is the minimum version supported.
AEM 6.1 was the last version using CoralUI 2. AEM 6.2+ use CoralUI 3. As such we can now use CoralUI 3 only and remove the dependency on CoralUI 2.