NPC refactor (#10122)

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Server/NPC/Pathfinding/Pathfinders/PathfindingComparer.cs

@@ -0,0 +1,10 @@
+namespace Content.Server.NPC.Pathfinding.Pathfinders
+{
+    public sealed class PathfindingComparer : IComparer<ValueTuple<float, PathfindingNode>>
+    {
+        public int Compare((float, PathfindingNode) x, (float, PathfindingNode) y)
+        {
+            return y.Item1.CompareTo(x.Item1);
+        }
+    }
+}