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/NodeContainer/NodeContainerComponent.cs

@@ -29,7 +29,7 @@ namespace Content.Server.NodeContainer
         [DataField("examinable")]
         private bool _examinable = false;
 
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
             foreach (var node in _nodes.Values)
@@ -62,6 +62,7 @@ namespace Content.Server.NodeContainer
             foreach (var node in Nodes.Values)
             {
                 node.AnchorUpdate();
+                node.AnchorStateChanged();
             }
         }