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/Items/Weapons/Ranged/BaseRanged.cs

@@ -83,7 +83,7 @@ namespace Server.Items
                 if (canSwing && attacker.HarmfulCheck(defender))
                 {
                     attacker.DisruptiveAction();
-                    attacker.NetState?.SendSwing(attacker.Serial, defender.Serial);
+                    attacker.NetState.SendSwing(attacker.Serial, defender.Serial);
 
                     if (OnFired(attacker, defender))
                     {