Engine Entity Anchoring Changes (#4195)

* Converted all SnapGridPositionChangedEvent subscriptions to AnchorStateChangedEvent.

* Fixes power tests with new anchored requirements.

* Moved AnchorableComponent into construction.
AnchorableComponent now uses Transform.Anchored.

* Fixed bug with nodes, power works again.

* Adds lifetime stages to Component.

* Update Engine to v0.4.70.

Content.Server/Light/Components/HandheldLightComponent.cs

@@ -57,7 +57,7 @@ namespace Content.Server.Light.Components
         /// </summary>
         private byte? _lastLevel;
 
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
 
@@ -67,7 +67,7 @@ namespace Content.Server.Light.Components
             Dirty();
         }
 
-        public override void OnRemove()
+        protected override void OnRemove()
         {
             base.OnRemove();
             Owner.EntityManager.EventBus.QueueEvent(EventSource.Local, new DeactivateHandheldLightMessage(this));