Squish: Fixing Mac

* removed unused object
* refactored invokeMenuItem()
* always lookup cppwindow to avoid failing type()
* use objects stored inside objects.map to avoid LookupError
* reverted raising timeout to 60s
* added workaround for missing focus on Mac right after
  startApplication()
* removed the need to have a shell-script called 'qtcreator'
  (make sure to add 'Qt Creator.app' as AUT now)

Change-Id: I21511d810deedf31dfb19b896edd21b79e73b755
Reviewed-by: Bill King <bill.king@nokia.com>
Reviewed-by: Robert Löhning <robert.loehning@nokia.com>

tests/system/shared/utils.py

@@ -169,12 +169,15 @@ def cleanUpUserFiles(pathsToProFiles=None):
     return doneWithoutErrors
 
 def invokeMenuItem(menu, item, subItem = None):
-    menuObject = waitForObjectItem("{type='QMenuBar' visible='true'}", menu)
+    menuObject = waitForObjectItem(":Qt Creator.QtCreator.MenuBar_QMenuBar", menu)
     activateItem(menuObject)
     itemObject = waitForObjectItem(objectMap.realName(menuObject), item)
+    waitFor("menuObject.visible", 1000)
     activateItem(itemObject)
     if subItem != None:
-        activateItem(waitForObjectItem("{type='QMenu' visible='1' title='%s'}" % item, subItem))
+        sub = itemObject.menu()
+        waitFor("sub.visible", 1000)
+        activateItem(waitForObjectItem(sub, subItem))
 
 def logApplicationOutput():
     # make sure application output is shown