Move events to App class.

Runtime/PhysicsEventManager.cs

@@ -1,26 +1,17 @@
-using System;
 using UnityEngine;
 
 namespace Utils
 {
     public class PhysicsEventManager : MonoBehaviour
     {
-        public delegate void FixedUpdateAction();
-
-        public static event FixedUpdateAction FixedUpdated;
-
         private void FixedUpdate()
         {
-            FixedUpdated?.Invoke();
+            App.InvokeFixedUpdate();
         }
 
         private void OnApplicationQuit()
         {
-            FixedUpdated = null;
+            App.ClearFixedUpdate();
         }
-
-        public static Delegate[] FixedUpdateDelegates => FixedUpdated?.GetInvocationList();
-
-        public static int FixedUpdateLength => FixedUpdateDelegates?.Length ?? 0;
     }
 }