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

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Assets/Scripts/EditorGame/Base/ProjectFiles/BeatmapContainer.cs

@@ -68,6 +68,9 @@ namespace Ichni.RhythmGame
                 {
                     if (element is GameElement_BM gameElement)
                     {
+#if UNITY_EDITOR
+                        Debug.Log("Adding element to identifier: " + gameElement.elementName + " " + gameElement.elementGuid);
+#endif
                         GameElement_BM.identifier.Add(gameElement.elementGuid, gameElement);
                     }