增加Tracks公开属性

SpineRuntimes/SpineRuntime21/AnimationState.cs

@@ -41,6 +41,7 @@ namespace SpineRuntime21 {
 
 		public AnimationStateData Data { get { return data; } }
 		public float TimeScale { get { return timeScale; } set { timeScale = value; } }
+		public List<TrackEntry> Tracks => tracks;
 
         public delegate void StartEndDelegate(AnimationState state, int trackIndex);
 		public event StartEndDelegate Start;