Replace addItemToMenu() with standard addItemWithTitle

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/apps/gworkspace/trunk@36349 72102866-910b-0410-8b05-ffd578937521
Replace addItemToMenu() with standard addItemWithTitle

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/apps/gworkspace/trunk@36350 72102866-910b-0410-8b05-ffd578937521