Implement animation.

Assets/Cryville/Crtr/SkinContainer.cs

@@ -140,6 +140,15 @@ namespace Cryville.Crtr {
 			}
 			if (rc.PropSrcs != null) ChartPlayer.etor.ContextCascadeDiscard();
 		}
+		public void MatchAnimation(AnimationSpan span, float rtime, RuntimeSkinContext ctx) {
+			foreach (var p in span.properties) {
+				p.Key.ExecuteDynamic(_group, ctx, p.Value, 0);
+			}
+			foreach (var s in span.spans) {
+				if (rtime < s.Key.Behind || rtime >= s.Key.Ahead) continue;
+				MatchAnimation(s.Value, rtime, ctx);
+			}
+		}
 	}
 	public class SkinContext {
 		public Transform Transform { get; private set; }