AI sleeping (#1708)

* AI sleeping

AI no longer update when dead.

* It was easier to merge master and re-apply it.

* Update AiControllerComponent.cs

Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>
Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

Content.Server/GameObjects/EntitySystems/AI/SleepAiMessage.cs

@@ -0,0 +1,24 @@
+using Robust.Server.AI;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.GameObjects.EntitySystems.AI
+{
+    /// <summary>
+    ///     Indicates whether an AI should be updated by the AiSystem or not.
+    ///     Useful to sleep AI when they die or otherwise should be inactive.
+    /// </summary>
+    internal sealed class SleepAiMessage : EntitySystemMessage
+    {
+        /// <summary>
+        ///     Sleep or awake.
+        /// </summary>
+        public bool Sleep { get; }
+        public AiLogicProcessor Processor { get; }
+        
+        public SleepAiMessage(AiLogicProcessor processor, bool sleep)
+        {
+            Processor = processor;
+            Sleep = sleep;
+        }
+    }
+}