Bug 294790 [KeyBindings] LegacyActionTools should support SWT.F13 - F20
bundles/org.eclipse.jface/src/org/eclipse/jface/action/LegacyActionTools.java
/**
	 * Table of key codes (key type: <code>String</code>, value type:
	 * <code>Integer</code>); <code>null</code> if not yet initialized.
	 * 
	 * @see #findKeyCode
	 */
	private static Map keyCodes = null;