constructor(fps) {
    this.fps = fps;
    this.frame = 0;
    this.duration = 0;
    this.framesNum = 0;
    this.frameData = new FrameData();
    this.segments = [];
    this.scenes = [];
  }
Timeline - A timeline class to manage scenes and animations

####Example:

    const timeline = new Timeline(60);
    timeline.annotate(scenes);
    timeline.nextFrame();

@class