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/Disposal/Unit/Components/DisposalHolderComponent.cs

@@ -58,14 +58,14 @@ namespace Content.Server.Disposal.Unit.Components
         [DataField("air")]
         public GasMixture Air { get; set; } = new GasMixture(Atmospherics.CellVolume);
 
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
 
             _contents = ContainerHelpers.EnsureContainer<Container>(Owner, nameof(DisposalHolderComponent));
         }
 
-        public override void OnRemove()
+        protected override void OnRemove()
         {
             base.OnRemove();
             ExitDisposals();