384269: update feature constraints for Mylyn 3.9

Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=384269
397620: [editor] Improve ordering of sections

Change-Id: I10a7cbb2f09575a3c619923d90aab76ae2fed96d
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=397620
387836: Reviewers should always be expanded

Change-Id: Ib84c1d0cf536e6b1abbdf13ee022df62a492f5e5
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=387836