New Flutter Animation

This app contains these demos. 1. Birds 2. Fireworks 3. Sphere 4. Cards 5. Ambient background 6. Wind 7. Ripple 8. Rays 9. Sun 10. Calendar animation 11. Particles on path 12. Shimmering 13. Confetti 14. Comet trail 15. Cloud Sim 16. Snow Sim 17. Fireball 18. Helicity 19. Troika