2) Remove ThunkIfrSupportLib.h
3) Update some comments.
4) Add GetAttributesOfFirstFormSet to scan form package to read formset title, class info.
5) Clean up function related to package registration code.
6) Clean up RemovePackNotify
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5705 6f19259b-4bc3-4df7-8a09-765794883524