Bug 320788 [Model] The model misses the possibility to define mnemonics for Menu-Elements
It looks like we forgot to add mnemonics to the Menu-Element like we have one in the MenuItem
bundles/org.eclipse.e4.ui.model.workbench/src/org/eclipse/e4/ui/model/application/ui/menu/impl/MenuPackageImpl.java
/**
	 * Returns the factory that creates the instances of the model.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @return the factory that creates the instances of the model.
	 * @generated
	 */
	public MMenuFactory getMenuFactory() {
		return (MMenuFactory)getEFactoryInstance();
	}
	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	private boolean isCreated = false;
	/**
	 * Creates the meta-model objects for the package.  This method is
	 * guarded to have no affect on any invocation but its first.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void createPackageContents() {
		if (isCreated) return;
		isCreated = true;
		
		itemEClass = createEClass(ITEM);
		createEAttribute(itemEClass, ITEM__ENABLED);
		createEAttribute(itemEClass, ITEM__SELECTED);