Watching How to Train Your Dragon: The Hidden World, I was reminded of another animated trilogy capper: Toy Story 3. Both are animated series that basically aged with their audiences. If you started watching these movies when you were a kid, you’re at a very different point in your life watching the third installment, and both movies are kind of about putting childish things away. For Toy Story, it was about moving on from your childhood toys, and for How to Train Your Dragon, it’s about moving on from your childhood pets. Dragon has a difficult time because …