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/views/actions/PasteAction.java
public PasteAction( Object selectedObject )
	{
		this( selectedObject, DEFAULT_TEXT );
	}
	/**
	 * Create a new paste action with given selection and text
	 * 
	 * @param selectedObject
	 *            the selected object,which cannot be null
	 * @param text
	 *            the text of the action
	 */
	public PasteAction( Object selectedObject, String text )
	{
		super( selectedObject, text );
		ISharedImages shareImages = PlatformUI.getWorkbench( )
				.getSharedImages( );
		setImageDescriptor( shareImages.getImageDescriptor( ISharedImages.IMG_TOOL_PASTE ) );
		setDisabledImageDescriptor( shareImages.getImageDescriptor( ISharedImages.IMG_TOOL_PASTE_DISABLED ) );
		setAccelerator( SWT.CTRL | 'V' );
	}
	/**
	 * Runs this action. Copies the content. Each action implementation must
	 * define the steps needed to carry out this action. The default
	 * implementation of this method in <code>Action</code> does nothing.
	 */
	public void run( )
	{
		if ( Policy.TRACING_ACTIONS )
		{