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/Operators/Inventory/InteractWithEntityOperator.cs

@@ -0,0 +1,48 @@
+using Content.Server.GameObjects.Components.Mobs;
+using Content.Server.GameObjects.EntitySystems;
+using Content.Server.Utility;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.IoC;
+
+namespace Content.Server.AI.Operators.Inventory
+{
+    /// <summary>
+    /// A Generic interacter; if you need to check stuff then make your own
+    /// </summary>
+    public class InteractWithEntityOperator : AiOperator
+    {
+        private readonly IEntity _owner;
+        private readonly IEntity _useTarget;
+
+        public InteractWithEntityOperator(IEntity owner, IEntity useTarget)
+        {
+            _owner = owner;
+            _useTarget = useTarget;
+
+        }
+
+        public override Outcome Execute(float frameTime)
+        {
+            if (_useTarget.Transform.GridID != _owner.Transform.GridID)
+            {
+                return Outcome.Failed;
+            }
+
+            if (!InteractionChecks.InRangeUnobstructed(_owner, _useTarget.Transform.MapPosition))
+            {
+                return Outcome.Failed;
+            }
+
+            if (_owner.TryGetComponent(out CombatModeComponent combatModeComponent))
+            {
+                combatModeComponent.IsInCombatMode = false;
+            }
+
+            // Click on da thing
+            var interactionSystem = IoCManager.Resolve<IEntitySystemManager>().GetEntitySystem<InteractionSystem>();
+            interactionSystem.UseItemInHand(_owner, _useTarget.Transform.GridPosition, _useTarget.Uid);
+
+            return Outcome.Success;
+        }
+    }
+}