Remove FoodContainer, add whitelists, replace with SpawnItemsOnUse (#4358)

Content.Server/Storage/EntitySystems/ItemCounterSystem.cs

@@ -0,0 +1,41 @@
+using System.Collections.Generic;
+using Content.Server.Storage.Components;
+using Content.Shared.Storage.ItemCounter;
+using JetBrains.Annotations;
+using Robust.Shared.Containers;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Storage.EntitySystems
+{
+    [UsedImplicitly]
+    public class ItemCounterSystem : SharedItemCounterSystem
+    {
+        protected override bool TryGetContainer(ContainerModifiedMessage msg,
+            ItemCounterComponent itemCounter,
+            out IReadOnlyList<string> showLayers)
+        {
+            if (msg.Container.Owner.TryGetComponent(out ServerStorageComponent? component))
+            {
+                var containedLayers = component.StoredEntities ?? new List<IEntity>();
+                var list = new List<string>();
+                foreach (var mapLayerData in itemCounter.MapLayers.Values)
+                {
+                    foreach (var entity in containedLayers)
+                    {
+                        if (mapLayerData.Whitelist.IsValid(entity))
+                        {
+                            list.Add(mapLayerData.Layer);
+                            break;
+                        }
+                    }
+                }
+
+                showLayers = list;
+                return true;
+            }
+
+            showLayers = new List<string>();
+            return false;
+        }
+    }
+}