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/Utility/BehaviorSets/IdleBehaviorSet.cs

@@ -0,0 +1,18 @@
+using Content.Server.AI.Utility.Actions;
+using Content.Server.AI.Utility.Actions.Idle;
+using Robust.Shared.Interfaces.GameObjects;
+
+namespace Content.Server.AI.Utility.BehaviorSets
+{
+    public class IdleBehaviorSet : BehaviorSet
+    {
+        public IdleBehaviorSet(IEntity owner) : base(owner)
+        {
+            Actions = new IAiUtility[]
+            {
+                new CloseLastEntityStorage(Owner), 
+                new WanderAndWait(Owner),
+            };
+        }
+    }
+}