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/Atmos/Components/GasTankComponent.cs

@@ -124,7 +124,7 @@ namespace Content.Server.Atmos.Components
         [DataField("tank")]
         public string TankName { get; set; } = "tank";
 
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
             _userInterface = Owner.GetUIOrNull(SharedGasTankUiKey.Key);