Bug 131835 Clean up FO related code
Now that FO is not part of BIRT, clean up all references to FO, including the FORenderOption, TailoredForFOP, etc.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineTask.java
protected static int id = 0;
	/**
	 * the contexts for running this task
	 */
	protected Map appContext;
	/**
	 * a reference to the report engine
	 */
	protected IReportEngine engine;
	/**
	 * Comment for <code>locale</code>
	 */
	protected Locale locale = Locale.getDefault( );
	/**
	 * the execution context
	 */
	protected ExecutionContext executionContext;
	/**
	 * task identifier. Could be used for logging
	 */
	protected int taskID;
	protected IReportRunnable runnable;
	/**
	 * options used to render the report design.
	 */
	protected IRenderOption renderOptions;
	/**
	 * does the parameter has been changed by the user.
	 */
	protected boolean parameterChanged = true;