SnapGridComponent Removal (#3884)

* Removed SnapGridOffset, there is only center now.

* SnapGridComponent methods are now static.

* Removed SnapGridComponent.OnPositionChanged.

* Refactored static functions off SnapGridComponent to MapGrid.
Refactored away usages of SnapGridComponent.Position.

* Added Transform.Anchored for checking if an entity is a tile entity.
More refactoring for static MapGrid functions.

* Static snapgrid methods on MapGrid are no longer static.

* Add setter to ITransformComponent.Anchored.
Removed direct references to SnapGridComponent from content.

* Grid functions now deal with EntityUids instead of SnapGridComponents.
Began renaming public API functions from SnapGrid to Anchor.

* Remove the SnapGridComponent 'Offset' field from all yaml files. This was removed in code previously, so the yaml linter was upset.

* Update engine submodule to v0.4.46.

Content.Client/GameObjects/EntitySystems/WindowSystem.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using Content.Client.GameObjects.Components;
 using JetBrains.Annotations;
 using Robust.Shared.GameObjects;
@@ -15,6 +15,7 @@ namespace Content.Client.GameObjects.EntitySystems
             base.Initialize();
 
             SubscribeLocalEvent<WindowSmoothDirtyEvent>(HandleDirtyEvent);
+            SubscribeLocalEvent<WindowComponent, SnapGridPositionChangedEvent>(HandleSnapGridMove);
         }
 
         public override void Shutdown()
@@ -22,6 +23,7 @@ namespace Content.Client.GameObjects.EntitySystems
             base.Shutdown();
 
             UnsubscribeLocalEvent<WindowSmoothDirtyEvent>();
+            UnsubscribeLocalEvent<WindowComponent, SnapGridPositionChangedEvent>(HandleSnapGridMove);
         }
 
         private void HandleDirtyEvent(WindowSmoothDirtyEvent ev)
@@ -32,6 +34,11 @@ namespace Content.Client.GameObjects.EntitySystems
             }
         }
 
+        private static void HandleSnapGridMove(EntityUid uid, WindowComponent component, SnapGridPositionChangedEvent args)
+        {
+            component.SnapGridOnPositionChanged();
+        }
+
         public override void FrameUpdate(float frameTime)
         {
             base.FrameUpdate(frameTime);