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/CharacterAppearance/Components/MagicMirrorComponent.cs

@@ -22,7 +22,7 @@ namespace Content.Server.CharacterAppearance.Components
 
         [ViewVariables] private BoundUserInterface? UserInterface => Owner.GetUIOrNull(MagicMirrorUiKey.Key);
 
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
 
@@ -32,7 +32,7 @@ namespace Content.Server.CharacterAppearance.Components
             }
         }
 
-        public override void OnRemove()
+        protected override void OnRemove()
         {
             if (UserInterface != null)
             {