Updates Message Packets (#321)

### API Breaking Change
Combined `AsciiMessage` and `UnicodeMessage` into a single function that takes two arguments, `bool ascii` and `string lang`. Lang can be null (or anything) if ascii is true. 

- [X] Changes message packets
- [X] Cleans up some code
- [X] Uses benchmarks to determine if the spanwriter + copyfrom

Projects/Server/Network/NetState/NetState.cs

@@ -353,7 +353,7 @@ namespace Server.Network
 
         public void LaunchBrowser(string url)
         {
-            Send(new MessageLocalized(Serial.MinusOne, -1, MessageType.Label, 0x35, 3, 501231, "", ""));
+            this.SendMessageLocalized(Serial.MinusOne, -1, MessageType.Label, 0x35, 3, 501231);
             Send(new LaunchBrowser(url));
         }