refactor: Explicit private declarations, Initialize events as empty delegates, move NavMeshComponents license file

Assets/BossRoom/Scripts/Server/Navigation/DynamicNavObstacle.cs

     {
         private NavigationSystem m_NavigationSystem;
 
-        void Awake()
+        private void Awake()
-        void OnValidate()
+        private void OnValidate()
         {
             if (gameObject.scene.rootCount > 1) // Hacky way for checking if this is a scene object or a prefab instance and not a prefab definition.
             {
             }
         }
 
-        void OnEnable()
+        private void OnEnable()
-        void OnDisable()
+        private void OnDisable()
         {
             m_NavigationSystem.OnDynamicObstacleDisabled();
         }

Assets/BossRoom/Scripts/Server/Navigation/NavigationSystem.cs

         /// <summary>
         /// Event that gets invoked when the navigation mesh changed. This happens when dynamic obstacles move or get active
         /// </summary>
-        public event System.Action OnNavigationMeshChanged;
+        public event System.Action OnNavigationMeshChanged = delegate{};
 
         /// <summary>
         /// Whether all paths need to be recalculated in the next fixed update.
             // This is done in fixed update to make sure that only one expensive global recalculation happens per fixed update.
             if (navMeshChanged)
             {
-                OnNavigationMeshChanged?.Invoke();
+                OnNavigationMeshChanged.Invoke();
                 navMeshChanged = false;
             }
         }