Various bug fixes

Fix sim room system error
Added stub for obtain item in field
Properly save tutorial data

nksrv/LobbyServer/Msgs/Simroom/GetSimRoomData.cs

@@ -0,0 +1,22 @@
+using nksrv.Utils;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace nksrv.LobbyServer.Msgs.Simroom
+{
+    [PacketPath("/simroom/get")]
+    public class GetSimRoomData : LobbyMsgHandler
+    {
+        protected override async Task HandleAsync()
+        {
+            var req = await ReadData<ReqGetSimRoom>();
+
+            var response = new ResGetSimRoom();
+            // TODO
+            WriteData(response);
+        }
+    }
+}