fixes #28506

Packagizer and Global Autostart options work now even if the Linkgrabber is not the active tab. 

git-svn-id: svn://svn.appwork.org/utils@2048 21714237-3853-44ef-a1f0-ef8f03a7d1fe
DelayedRunnable: stop now returns if delayer was running or not
EventSender:
-speed optimized hasListener
-containsListener does not need to be synchronized


git-svn-id: svn://svn.appwork.org/utils@2049 21714237-3853-44ef-a1f0-ef8f03a7d1fe
git-svn-id: svn://svn.appwork.org/utils@2050 21714237-3853-44ef-a1f0-ef8f03a7d1fe