Function step_destroy_widget

UnitTests/UnitTest_AttachDetach/DemoKeeper.cpp:166–174

	}

	static void step_destroy_widget()
	{
		MyGUI::Widget* widget = get_random(all_widgets);
		if (!widget)
			return;
		/*if (!widget->isRootWidget()) */
		MyGUI::WidgetManager::getInstance().destroyWidget(widget);
		test_widgets();
	}

	static void step_destroy_widget(int _count)
	{