Handle NMT Login packet

src/Prospect.Unreal/Net/Actors/AGameModeBase.cs

@@ -0,0 +1,10 @@
+namespace Prospect.Unreal.Net.Actors;
+
+public class AGameModeBase : AInfo
+{
+    public void PreLogin(string options, string address, FUniqueNetIdRepl uniqueId, out string? errorMessage)
+    {
+        // Login unique id must match server expected unique id type OR No unique id could mean game doesn't use them
+        errorMessage = null;
+    }
+}