code: public static void start(String name, Version version, String resourcesDir)
      {
          Engine.start(new EngineHeadless(name, version, resourcesDir));
      }
docs: Start engine. Has to be called before anything and only one time, in the main.
  
  @param name The program name (must not be <code>null</code>).
  @param version The program version (must not be <code>null</code>).
  @param resourcesDir The main resources directory (must not be <code>null</code>).
  @throws LionEngineException If arguments error.