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();
  }