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

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Assets/Scripts/EditorGame/GameElements/ElementFolder/ElementFolder.cs

@@ -103,7 +103,7 @@ namespace Ichni.RhythmGame
 
             public override GameElement DuplicateBM(GameElement parent)
             {
-                return ElementFolder.GenerateElement(elementName, elementGuid, tags, false, parent);
+                return ElementFolder.GenerateElement(elementName, Guid.NewGuid(), tags, false, parent);
             }
         }
     }