Bug 183733 Implement the IScriptOjectClassInfo to provide the class infromation to support the JS code assistant.
Engine should implement the IScriptObjectClassInfo interface to return the class information for script object.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/ScriptedDesignVisitor.java
} else if ( handle instanceof ImageHandle )
			{
				ImageScriptExecutor.handleOnPrepare( ( ImageHandle ) handle,
						executionContext );
			} else if ( handle instanceof LabelHandle )
			{
				LabelScriptExecutor.handleOnPrepare( ( LabelHandle ) handle,
						executionContext );
			} else if ( handle instanceof ListHandle )
			{
				ListScriptExecutor.handleOnPrepare( ( ListHandle ) handle,
						executionContext );
			} else if ( handle instanceof TableHandle )
			{
				TableScriptExecutor.handleOnPrepare( ( TableHandle ) handle,
						executionContext );
			} else if ( handle instanceof TextItemHandle )
			{
				TextItemScriptExecutor.handleOnPrepare(
						( TextItemHandle ) handle, executionContext );
			} else if ( handle instanceof TextDataHandle )
			{
				DynamicTextScriptExecutor.handleOnPrepare(
						( TextDataHandle ) handle, executionContext );
			} else if ( handle instanceof AutoTextHandle )
			{
				AutoTextScriptExecutor.handleOnPrepare(
						( AutoTextHandle ) handle, executionContext );
			} else