Load emotes with the Saturn emote library

- Emotes loads assets/saturnclient/player_animations/*.json with
  emotes-core into Saturn's own EmoteRegistry (not the library's shared
  one, so other mods can't replace them), and lists the ones that loaded
  for the wheel.
- The emote wheel now also sends the emote to the server, so other
  players see it. It only played locally before.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

build.gradle

@@ -8,4 +8,5 @@ java {
 
 dependencies {
     implementation "dev.selimaj:session-java:0.2.0"
+    implementation "org.saturnclient:emotes-core:${emotes_version}"
 }