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/EnvironmentObjects/EnvironmentObject.cs

@@ -59,7 +59,7 @@ namespace Ichni.RhythmGame
 
             public override GameElement DuplicateBM(GameElement parent)
             {
-                return EnvironmentObject.GenerateElement(elementName, elementGuid, tags, false, 
+                return EnvironmentObject.GenerateElement(elementName, Guid.NewGuid(), tags, false, 
                     parent, themeBundleName, objectName, isStatic);
             }
         }