Removed getBackend from Cura (and onto Uranium)

cura/CuraApplication.py

@@ -694,13 +694,6 @@ class CuraApplication(QtApplication):
 
             qmlRegisterType(QUrl.fromLocalFile(path), "Cura", 1, 0, type_name)
 
-    ##  Get the backend of the application (the program that does the heavy lifting).
-    #   The backend is also a QObject, which can be used from qml.
-    #   \returns Backend \type{Backend}
-    @pyqtSlot(result = "QObject*")
-    def getBackend(self):
-        return self._backend
-
     def onSelectionChanged(self):
         if Selection.hasSelection():
             if self.getController().getActiveTool():