Split out the UDP listener for a single instance

MistoxServer/Interface/ClientInterface.cs

@@ -36,13 +36,18 @@ namespace Mistox {
         }
 
         public async Task SendAllClients<Packet>(Packet data) {
-            foreach(KeyValuePair<string, mUDPClient> cur in serverInstance.clientConnections){
+            foreach( KeyValuePair<UInt128, mUDPClient> cur in serverInstance.clientConnections ){
                 await cur.Value.Send( data );
             }
         }
 
         public async Task SendClient<Packet>(string UserName, Packet data) {
-            await serverInstance.clientConnections[UserName].Send( data );
+            foreach( KeyValuePair<UInt128, mUDPClient> cur in serverInstance.clientConnections) {
+                if (cur.Value.UserName.ToLower() == UserName.ToLower()) {
+                    await cur.Value.Send( data );
+                    break;
+                }
+            }
         }
 
         public async Task SendServer<Packet>(Packet data) {