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/Singularity/Components/ServerSingularityComponent.cs

@@ -113,7 +113,7 @@ namespace Content.Server.Singularity.Components
             return new SingularityComponentState(Level);
         }
 
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
 
@@ -175,7 +175,7 @@ namespace Content.Server.Singularity.Components
                 Energy++;
         }
 
-        public override void OnRemove()
+        protected override void OnRemove()
         {
             _playingSound?.Stop();
             SoundSystem.Play(Filter.Pvs(Owner), "/Audio/Effects/singularity_collapse.ogg", Owner.Transform.Coordinates);