Started Working on Downloadlist change event system

git-svn-id: svn://svn.appwork.org/utils@2129 21714237-3853-44ef-a1f0-ef8f03a7d1fe
git-svn-id: svn://svn.appwork.org/utils@2130 21714237-3853-44ef-a1f0-ef8f03a7d1fe
git-svn-id: svn://svn.appwork.org/utils@2131 21714237-3853-44ef-a1f0-ef8f03a7d1fe