Add utility AI (#806)

Co-authored-by: Pieter-Jan Briers <pieterjan.briers@gmail.com>
Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>
Co-authored-by: Pieter-Jan Briers <pieterjan.briers+git@gmail.com>

Content.Server/AI/WorldState/States/Inventory/LastOpenedStorageState.cs

@@ -0,0 +1,26 @@
+using Content.Server.GameObjects.Components;
+using Robust.Shared.Interfaces.GameObjects;
+using Logger = Robust.Shared.Log.Logger;
+
+namespace Content.Server.AI.WorldState.States.Inventory
+{
+    /// <summary>
+    /// If we open a storage locker than it will be stored here
+    /// Useful if we want to close it after
+    /// </summary>
+    public sealed class LastOpenedStorageState : StoredStateData<IEntity>
+    {
+        // TODO: IF we chain lockers need to handle it.
+        // Fine for now I guess
+        public override string Name => "LastOpenedStorage";
+
+        public override void SetValue(IEntity value)
+        {
+            base.SetValue(value);
+            if (value != null && !value.HasComponent<EntityStorageComponent>())
+            {
+                Logger.Warning("Set LastOpenedStorageState for an entity that doesn't have a storage component");
+            }
+        }
+    }
+}