Added Unity project files

Packages/com.vrchat.base/Editor/VRCSDK/Dependencies/VRChat/ProtectVPMPackages.cs

@@ -0,0 +1,36 @@
+using System.Collections.Generic;
+using System.IO;
+using UnityEngine;
+
+namespace VRC.SDKBase.Editor
+{
+    public class ProtectVPMPackages : UnityEditor.AssetModificationProcessor
+    {
+        public static string[] OnWillSaveAssets(string[] paths)
+        {
+            // skip check if settings allows changes
+            if (VRCPackageSettings.Instance.allowVRCPackageChanges) return paths;
+            
+            List<string> pathsToSave = new List<string>();
+
+            for (int i = 0; i < paths.Length; ++i)
+            {
+                var path = paths[i];
+                var directories = path.Split(Path.DirectorySeparatorChar);
+                if (directories.Length >= 2)
+                {
+                    var filename = Path.GetFileName(path);
+                    var extension = Path.GetExtension(path);
+                    if (directories[0] == "Packages" && directories[1].StartsWith("com.vrchat") && !(filename == "MirrorReflection.mat") && ! path.Contains("UdonProgramSources") && !path.Contains("SerializedUdonPrograms") && !(extension == ".meta"))
+                    {
+                        Debug.LogWarning(
+                            $"Something tried to change {path}, which is part of a VRC Package, and will not be changed. Use \"Save As...\" instead if you want to make your own version.");
+                        continue;
+                    }
+                }
+                pathsToSave.Add(path);
+            }
+            return pathsToSave.ToArray();
+        }
+    }
+}