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/ContainmentFieldGeneratorComponent.cs

@@ -182,7 +182,7 @@ namespace Content.Server.Singularity.Components
             }
         }
 
-        public override void OnRemove()
+        protected override void OnRemove()
         {
             _connection1?.Item2.Dispose();
             _connection2?.Item2.Dispose();