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/UOContent/Skills/Tracking/QuestArrow.cs

@@ -35,7 +35,7 @@ namespace Server
                 return;
             }
 
-            Mobile.NetState?.SendSetArrow(x, y, Target.Serial);
+            Mobile.NetState.SendSetArrow(x, y, Target.Serial);
         }
 
         public void Stop()
@@ -51,7 +51,7 @@ namespace Server
             }
 
             Mobile.ClearQuestArrow();
-            Mobile.NetState?.SendCancelArrow(x, y, Target.Serial);
+            Mobile.NetState.SendCancelArrow(x, y, Target.Serial);
 
             Running = false;
             OnStop();