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/ParticleAccelerator/Components/ParticleAcceleratorControlBoxComponent.cs

@@ -99,7 +99,7 @@ namespace Content.Server.ParticleAccelerator.Components
             ? ParticleAcceleratorPowerState.Level3
             : ParticleAcceleratorPowerState.Level2;
 
-        public override void Initialize()
+        protected override void Initialize()
         {
             base.Initialize();
             if (UserInterface != null)
@@ -240,7 +240,7 @@ namespace Content.Server.ParticleAccelerator.Components
             }
         }
 
-        public override void OnRemove()
+        protected override void OnRemove()
         {
             UserInterface?.CloseAll();
             base.OnRemove();