Bug 166015 Refactor designer actions to eclipse command framework
Eclipse command framework provide a more explicit way to manage UI actions contributions, we can take it's advantage to make our actions code more clean and maintainable.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/parts/GraphicalEditorWithFlyoutPalette.java
/**
	 * Returns the selection listener.
	 * 
	 * @return the <code>ISelectionListener</code>
	 */
	protected ISelectionListener getSelectionListener( )
	{
		return selectionListener;
	}
	/**
	 * Adds an action to this editor's <code>ActionRegistry</code>. (This is
	 * a helper method.)
	 * 
	 * @param action
	 *            the action to add.
	 */
	protected void addAction( IAction action )
	{
		getActionRegistry( ).registerAction( action );
	}
	/**
	 * Adds an editor action to this editor.
	 * 
	 * <p>
	 * <Editor actions are actions that depend and work on the editor.
	 * 
	 * @param action
	 *            the editor action
	 */
	protected void addEditorAction( EditorPartAction action )