将Spline移出Plugin，以调整SplineRenderer的OnWillCameraRender

Assets/Dreamteck/Utilities/DuplicateUtility.cs

@@ -0,0 +1,24 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Dreamteck
+{
+    public static class DuplicateUtility
+    {
+        public static AnimationCurve DuplicateCurve(AnimationCurve input)
+        {
+            AnimationCurve target = new AnimationCurve();
+            target.postWrapMode = input.postWrapMode;
+            target.preWrapMode = input.preWrapMode;
+            for (int i = 0; i < input.keys.Length; i++) target.AddKey(input.keys[i]);
+            return target;
+        }
+
+        public static Gradient DuplicateGradient(Gradient input)
+        {
+            //yet to implement
+            return null;
+        }
+    }
+}