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/GameObjects/EntitySystems/AI/Pathfinding/GraphUpdates/TileUpdate.cs

@@ -0,0 +1,14 @@
+using Robust.Shared.Map;
+
+namespace Content.Server.GameObjects.EntitySystems.AI.Pathfinding.GraphUpdates
+{
+    public struct TileUpdate : IPathfindingGraphUpdate
+    {
+        public TileUpdate(TileRef tile)
+        {
+            Tile = tile;
+        }
+
+        public TileRef Tile { get; }
+    }
+}