FadingMovingParticle constructor
      
      FadingMovingParticle({})
     
    
A particle that fades out over time while moving.
Implementation
FadingMovingParticle({
  required double lifespan,
  required this.position,
  required this.speed,
  required this.acceleration,
  required this.radius,
  required this.baseColor,
  required this.fadeOutDuration,
}) : super(lifespan: lifespan);