Delay CopyExampleInputFiles from DidReloadScripts to editor update

As Resource.Load fails and returns null during asset import SteamVR_Settings.instance cannot be called from DidReloadScripts

Fixes ValveSoftware#949

Assets/SteamVR/Input/Editor/SteamVR_CopyExampleInputFiles.cs

@@ -17,6 +17,13 @@ public class SteamVR_CopyExampleInputFiles : Editor
         [UnityEditor.Callbacks.DidReloadScripts]
         private static void OnReloadScripts()
         {
+            //Delay method calls as SteamVR_Settings.instance cannot be accessed from 'DidReloadScripts'
+            EditorApplication.update += Update;
+        }
+
+        private static void Update()
+        {
+            EditorApplication.update -= Update;
             SteamVR_Input.CheckOldLocation();
             CopyFiles();
         }