Pull up singleton behaviour.

Assets/Cryville/Crtr/UI/Menu.cs

@@ -1,3 +1,4 @@
+using Cryville.Common.Unity;
 using Cryville.Common.Unity.UI;
 using Cryville.Crtr.Browsing.UI;
 using System.Collections.Generic;
@@ -6,7 +7,7 @@ using UnityEngine;
 using unity = UnityEngine;
 
 namespace Cryville.Crtr.UI {
-	public class Menu : MonoBehaviour {
+	internal class Menu : SingletonBehaviour<Menu> {
 #pragma warning disable IDE0044
 		[SerializeField]
 		ResourceBrowserMaster m_browserMaster;
@@ -24,7 +25,7 @@ namespace Cryville.Crtr.UI {
 		bool initialized = false;
 		int totalTasks = 0;
 #pragma warning disable IDE0051
-		void Awake() {
+		protected override void Awake() {
 			Game.Init();
 			m_contents.SetActive(true);
 			PushTitle("Chart Browser");