The main application "ExtApp" has been renamed to "mitkWorkbench" in T12783. For naming consistency we should also rename the corresponding plugin org.mitk.gui.qt.extapplication.
Created branch bug-12959-RenameExtApplicationToWorkbenchapplication and started renaming (not working yet)
The plugin org.mitk.gui.qt.extapplication is still there and not renamed yet. So the bug is not finished.
(Or we decide to keep the plugin name, then it would be finished)