Shutdown grid rendering events (#4234)

Robust.Client/GameObjects/EntitySystems/GridRenderingSystem.cs

@@ -16,4 +16,9 @@ internal sealed class GridRenderingSystem : EntitySystem
     {
         _clyde.RegisterGridEcsEvents();
     }
+
+    public override void Shutdown()
+    {
+        _clyde.ShutdownGridEcsEvents();
+    }
 }

Robust.Client/Graphics/Clyde/Clyde.cs

@@ -176,6 +176,14 @@ namespace Robust.Client.Graphics.Clyde
             _entityManager.EventBus.SubscribeEvent<GridModifiedEvent>(EventSource.Local, this, _updateOnGridModified);
         }
 
+        public void ShutdownGridEcsEvents()
+        {
+            _entityManager.EventBus.UnsubscribeEvent<TileChangedEvent>(EventSource.Local, this);
+            _entityManager.EventBus.UnsubscribeEvent<GridStartupEvent>(EventSource.Local, this);
+            _entityManager.EventBus.UnsubscribeEvent<GridRemovalEvent>(EventSource.Local, this);
+            _entityManager.EventBus.UnsubscribeEvent<GridModifiedEvent>(EventSource.Local, this);
+        }
+
         private void GLInitBindings(bool gles)
         {
             _glBindingsContext = _glContext!.BindingsContext;

Robust.Client/Graphics/Clyde/ClydeHeadless.cs

@@ -88,6 +88,11 @@ namespace Robust.Client.Graphics.Clyde
             // Nada.
         }
 
+        public void ShutdownGridEcsEvents()
+        {
+
+        }
+
         public void SetWindowTitle(string title)
         {
             // Nada.

Robust.Client/Graphics/IClydeInternal.cs

@@ -65,6 +65,8 @@ namespace Robust.Client.Graphics
 
         void RegisterGridEcsEvents();
 
+        void ShutdownGridEcsEvents();
+
         void RunOnWindowThread(Action action);
     }
 }