constructor(conf = { rect: '', style: { fontSize: 28 } }) {
    super({ type: 'rect', ...conf });
    const { color = '#044EC5' } = this.conf;
    this.setColor(color);
  }
FFRect - A solid color rectangle component

####Example:

    const rect = new FFRect({ color: "#cc22ff", width: 400, height: 300 });
    rect.setColor("#00cc22");
    scene.addChild(rect);

@class