fix(network): Adds UOG & Fixes ConnectUO packet (#552)

- [X] Adds UOG Extended and Compact (0xF1 0x51 packet)
- [X] Fixes ConnectUO bad length

Projects/UOContent/Network/ConnectUO.cs

@@ -109,7 +109,7 @@ namespace Server.Network
 
             var writer = new SpanWriter(stackalloc byte[15]);
             writer.Write((byte)0xC0); // Packet ID
-            writer.Write(17); // Length
+            writer.Write((ushort)17); // Length
             writer.Write(ConnectUOProtocolVersion); // Version
             writer.Write((byte)_serverType);
             writer.Write((int)(Core.TickCount / 1000));