* 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>