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.Client/Storage/ClientStorageComponent.cs

@@ -33,7 +33,7 @@ namespace Content.Client.Storage
 
         public override IReadOnlyList<IEntity> StoredEntities => _storedEntities;
 
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
 
@@ -41,14 +41,14 @@ namespace Content.Client.Storage
             ChangeStorageVisualization(SharedBagState.Close);
         }
 
-        public override void OnAdd()
+        protected override void OnAdd()
         {
             base.OnAdd();
 
             _window = new StorageWindow(this) {Title = Owner.Name};
         }
 
-        public override void OnRemove()
+        protected override void OnRemove()
         {
             _window?.Dispose();
             base.OnRemove();