Add VRChat and GitHub packages to Unity project

Assets/Plugins/GitHub/Editor/UnityAPIWrapper.cs

@@ -0,0 +1,20 @@
+using UnityEditor;
+using UnityEngine;
+using System.IO;
+using System;
+
+namespace GitHub.Unity
+{
+    [InitializeOnLoad]
+    public class UnityAPIWrapper : ScriptableSingleton<UnityAPIWrapper>
+    {
+        static UnityAPIWrapper()
+        {
+#if UNITY_2018_2_OR_NEWER
+            Editor.finishedDefaultHeaderGUI += editor => {
+                UnityShim.Raise_Editor_finishedDefaultHeaderGUI(editor);
+            };
+#endif
+        }
+    }
+}