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/Mind/Components/VisitingMindComponent.cs

@@ -11,7 +11,7 @@ namespace Content.Server.Mind.Components
 
         [ViewVariables] public Mind Mind { get; set; } = default!;
 
-        public override void OnRemove()
+        protected override void OnRemove()
         {
             base.OnRemove();