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/BatteryDischargerComponent.cs

@@ -26,7 +26,7 @@ namespace Content.Server.Power.Components
         [DataField("activeSupplyRate")]
         private int _activeSupplyRate = 50;
 
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
             Owner.EnsureComponentWarn<PowerSupplierComponent>();