Code structure cleanup.

Assets/Cryville/Crtr/UI/Master.cs

@@ -0,0 +1,17 @@
+using UnityEngine;
+
+namespace Cryville.Crtr.UI {
+	internal class Master : MonoBehaviour {
+#pragma warning disable IDE0044
+		[SerializeField]
+		private GameObject m_menu;
+#pragma warning restore IDE0044
+
+		internal void ShowMenu() { m_menu.SetActive(true); }
+		internal void HideMenu() { m_menu.SetActive(false); }
+
+		void OnApplicationQuit() {
+			Game.Shutdown();
+		}
+	}
+}