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/Power/Components/BaseNetConnectorComponent.cs

@@ -25,13 +25,13 @@ namespace Content.Server.Power.Components
         [ViewVariables]
         private bool _needsNet = true;
 
-        public override void OnAdd()
+        protected override void OnAdd()
         {
             base.OnAdd();
             _net = NullNet;
         }
 
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
             if (_needsNet)
@@ -40,7 +40,7 @@ namespace Content.Server.Power.Components
             }
         }
 
-        public override void OnRemove()
+        protected override void OnRemove()
         {
             ClearNet();
             base.OnRemove();