Improve support for Unity 6.7+

- Added support for SerializedFile v26
- "Build Pipeline: Archives built with LZ4 compression now store each compressed chunk at a 16 byte aligned offset and cut chunks on file and serialized object boundaries..."

AssetStudioGUI/AssetStudioGUIForm.cs

@@ -1600,6 +1600,7 @@ namespace AssetStudioGUI
 
             Text = guiTitle;
             AssetItem.Reset();
+            SerializedFile.Clear();
             Studio.assetsManager.Clear();
             Studio.assemblyLoader.Clear();
             Studio.exportableAssets.Clear();