Detect more animated items

Okay cool, I noticed that "A Warm Winters Night Background" sometimes animates when other things are playing, but the animations aren't _detected_. (Huh, I actually thought we just didn't schedule ticks in that case? But maybe I'm missing something.)

Anyway, some movies don't use the built-in frames construct to animate, and instead use tweens that hook into the timeline and mutate the stage. Okay! Now we detect those.

This _did_ enable the Play/Pause button on some items that don't actually animate in practice, like the "#1 Fan Room Background", which seems to have an animated string of lights in the corner that got layered incorrectly. Maybe we should add a new glitch type, to flag movies that don't actually animate?

src/app/components/OutfitMovieLayer.js

@@ -453,7 +453,12 @@ export function buildMovieClip(library, libraryUrl) {
  */
 export function hasAnimations(createjsNode) {
   return (
+    // Some nodes have simple animation frames.
     createjsNode.totalFrames > 1 ||
+    // Tweens are a form of animation that can happen separately from frames.
+    // They expect timer ticks to happen, and they change the scene accordingly.
+    createjsNode?.timeline?.tweens?.length >= 1 ||
+    // And some nodes have _children_ that are animated.
     (createjsNode.children || []).some(hasAnimations)
   );
 }