Optimize GC for input config.

Assets/Cryville/Crtr/Config/InputConfigPanel.cs

@@ -1,6 +1,7 @@
 using Cryville.Common;
 using Cryville.Common.Unity;
 using Cryville.Input;
+using System;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
@@ -73,15 +74,22 @@ namespace Cryville.Crtr.Config {
 			_entries[e.Name].OnProxyChanged(e);
 		}
 
+		void Start() {
+			_d_HandleInputEvent = HandleInputEvent;
+		}
+
 		readonly List<InputSource?> _recvsrcs = new List<InputSource?>();
 		void Update() {
 			if (m_inputDialog.activeSelf) {
-				_consumer.EnumerateEvents(ev => {
-					AddSourceItem(ev.Identifier.Source);
-				});
+				_consumer.EnumerateEvents(_d_HandleInputEvent);
 			}
 		}
 
+		Action<InputEvent> _d_HandleInputEvent;
+		void HandleInputEvent(InputEvent ev) {
+			AddSourceItem(ev.Identifier.Source);
+		}
+
 		void AddSourceItem(InputSource? src) {
 			if (_recvsrcs.Contains(src)) return;
 			_recvsrcs.Add(src);