fix(network): Adds ConnectUO (#551)

- [X] Adds ability to create new protocol extension packets
- [X] Adds freeshard protocol extension support (packet 0xF1)
- [X] Adds ConnectUO support
- [X] Adds arbitrary read for `CircularBufferReader` and `SpanReader`

Projects/Server/Text/HexStringConverter.cs

@@ -89,7 +89,7 @@ namespace Server.Text
             return result;
         }
 
-        public static unsafe void GetBytes(string str, Span<byte> bytes)
+        public static unsafe void GetBytes(this string str, Span<byte> bytes)
         {
             fixed (char* strP = str)
             {