Replace player-animation-lib with the Saturn emote library

- Every version depends on org.saturnclient:emotes-fabric
  (${emotes_version}+<mc>, bundled). playEmote plays Saturn's emotes
  through it, and sneaking stops your own emote and tells the server.
  Emotes now work on 1.21.6+ too, where player-animation-lib was
  commented out.
- Removed every player-animation-lib and bendy-lib reference: the KoSmX
  repository, the dependencies, the player_anim properties, and the old
  (partly commented out) code in SaturnProviderImpl and KeyInputHandler.
- Build: Loom 1.15 -> 1.17.21 (the emotes jar is built with 1.17 and
  older Loom refuses it), Gradle 9.3 -> 9.8 (needed by Loom 1.17), and
  sourceSets moved out of the dependencies block in the root build.gradle,
  which Gradle 9.8 rejects.
- common: points at the emote-library branch (saturnclientmc/common#5).

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

versions/1.21.6/build.gradle

@@ -11,7 +11,6 @@ base {
 }
 
 repositories {
-    // maven { name = "KoSmX Maven"; url = 'https://maven.kosmx.dev/' }
 	maven { name = "Selimaj"; url = 'https://git.selimaj.dev/api/packages/selimaj-dev/maven' }
 }
 
@@ -24,10 +23,8 @@ dependencies {
 	// Fabric API. This is technically optional, but you probably want it anyway.
 	modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_api_version}"
 	
-	// Player Animation Library
-    // include modImplementation(
-    //     "dev.kosmx.player-anim:player-animation-lib-fabric:${project.player_anim}"
-    // )
+	// Saturn's emote library (limb bending, Emotecraft emotes)
+	include modImplementation("org.saturnclient:emotes-fabric:${project.emotes_version}+${project.minecraft_version}")
 
 	implementation project(":common")
 
@@ -37,11 +34,6 @@ dependencies {
     include implementation("com.fasterxml.jackson.core:jackson-databind:2.17.0")
     include implementation("com.fasterxml.jackson.core:jackson-annotations:2.17.0")
     include implementation("com.fasterxml.jackson.core:jackson-core:2.17.0")
-
-    // Optional: BendyLib
-    // include modRuntimeOnly(
-    //     "io.github.kosmx.bendy-lib:bendy-lib-fabric:${project.bendylib_version}"
-    // )
 }
 
 /*