Partial rewrite, missing:

- Correctly parsing incoming messages
- Sending the gamestate after relevant actions

Mau/GameState.cs

@@ -38,7 +38,7 @@ public class PlayerDTO
     public PlayerDTO(Player player)
     {
         Name = player.Connection.Name;
-        Id = player.Connection.ConnectionId;
+        Id = player.Connection.Id;
         CardsLeft = player.Hand.Count;
     }
 }