constructor(conf = { animations: [] }) {
    super({ type: 'extras', ...conf });
  }
FFExtras - A component that can be expanded freely

####Example:

    const extras = new FFExtras();
    extras.init = function(InkPaint){ ... }
    extras.update = function(InkPaint){ ... }
    extras.destroyed = function(InkPaint){ ... }
    scene.addChild(extras);

@class