Cross Track Point和Trail的进一步制作，修复Duplicate的Guid Bug

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Assets/Scripts/EditorGame/Animations/Track/TrackTotalTimeChange.cs

@@ -87,7 +87,7 @@ namespace Ichni.RhythmGame
 
             public override GameElement DuplicateBM(GameElement parent)
             {
-                return TrackTotalTimeChange.GenerateElement(elementName, elementGuid, tags, false,
+                return TrackTotalTimeChange.GenerateElement(elementName, Guid.NewGuid(), tags, false,
                     parent as Track, totalTime.ConvertToGameType());
             }
         }