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/Arcade/Components/BlockGameArcadeComponent.cs

@@ -104,7 +104,7 @@ namespace Content.Server.Arcade.Components
             UserInterface?.SendMessage(new BlockGameMessages.BlockGameUserStatusMessage(_player == session), session);
         }
 
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
             if (UserInterface != null)