Map & Grid Entities (#493)

* Client & Server load with new scene hierarchy.

* Engine Update.

Content.Server/GameObjects/Components/Power/PowerNodeComponent.cs

@@ -37,9 +37,9 @@ namespace Content.Server.GameObjects.Components.Power
         /// </summary>
         public event EventHandler<PowernetEventArgs> OnPowernetRegenerate;
 
-        public override void Initialize()
+        protected override void Startup()
         {
-            base.Initialize();
+            base.Startup();
 
             TryCreatePowernetConnection();
         }