Pathfinder rework (#11452)

Content.Shared/NPC/Events/PathRouteMessage.cs

@@ -0,0 +1,19 @@
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.NPC;
+
+/// <summary>
+/// Debug message containing a pathfinding route.
+/// </summary>
+[Serializable, NetSerializable]
+public sealed class PathRouteMessage : EntityEventArgs
+{
+    public List<DebugPathPoly> Path;
+    public Dictionary<DebugPathPoly, float> Costs;
+
+    public PathRouteMessage(List<DebugPathPoly> path, Dictionary<DebugPathPoly, float> costs)
+    {
+        Path = path;
+        Costs = costs;
+    }
+}