Added a menu item to copy the WebGLTemplates folder from the Package folder to the Assets folder

Author: De-Panther

MainProject/Assets/WebGLTemplates

@@ -0,0 +1 @@
+../../Packages/webxr/Hidden~/WebGLTemplates

Packages/webxr/Editor.meta

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+{
+    "name": "WebXR.Editor",
+    "references": [],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": true,
+    "precompiledReferences": [],
+    "autoReferenced": false,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

Packages/webxr/Editor/WebXR.Editor.asmdef

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+using UnityEditor;
+using UnityEngine;
+using System.IO;
+
+namespace WebXR.Editor
+{
+  public class WebXRMenu : UnityEditor.EditorWindow
+  {
+    public TextAsset packageReference;
+
+    [MenuItem("Window/WebXR/Copy WebGLTemplates")]
+    static void CopyWebGLTemplates()
+    {
+      if (!EditorUtility.DisplayDialog("Copy WebGLTemplates", "This action might override your WebGLTemplates folders and files. Make sure to have a backup", "Continue", "Cancel"))
+      {
+        return;
+      }
+      // Ugly hack to get package path by asset reference
+      WebXRMenu webXRMenu = (WebXRMenu)ScriptableObject.CreateInstance("WebXRMenu");
+      string packageAssetFullPath = Path.GetFullPath(AssetDatabase.GetAssetPath(webXRMenu.packageReference));
+      DestroyImmediate(webXRMenu);
+      string packagePath = Path.GetDirectoryName(packageAssetFullPath);
+
+      CopyFolder(Path.Combine(packagePath, "Hidden~"), Application.dataPath);
+      AssetDatabase.Refresh();
+    }
+
+    // modified version of https://docs.microsoft.com/en-us/dotnet/standard/io/how-to-copy-directories
+    private static void CopyFolder(string sourceFolderName, string destFolderName)
+    {
+      DirectoryInfo directory = new DirectoryInfo(sourceFolderName);
+
+      DirectoryInfo[] directories = directory.GetDirectories();
+      if (!Directory.Exists(destFolderName))
+      {
+        Directory.CreateDirectory(destFolderName);
+      }
+
+      FileInfo[] files = directory.GetFiles();
+      // In the source repository, it'll throw an error,
+      // as it'll try to copy from the same file, to the same file (symlink)
+      foreach (FileInfo file in files)
+      {
+        string temppath = Path.Combine(destFolderName, file.Name);
+        try
+        {
+          file.CopyTo(temppath, true);
+        }
+        catch (IOException exception)
+        {
+          Debug.LogError(exception.Message);
+        }
+      }
+
+      foreach (DirectoryInfo subFolder in directories)
+      {
+        string temppath = Path.Combine(destFolderName, subFolder.Name);
+        CopyFolder(subFolder.FullName, temppath);
+      }
+    }
+  }
+}