Cleanup unnessisary interface classes

MistoxServer/Server/ServerConnection.cs

@@ -13,20 +13,20 @@ namespace Mistox.Server {
         public Vector3 Position { get; set; }                               // The ingame position of the player
         public bool Connected { get; set; } = true;                         // Is the connection valid
         
-        private readonly ServerEntity _parent;
+        private readonly MistoxServer _parent;
         private readonly TcpClient _client;
         private readonly IPEndPoint _remoteAddress;
         private readonly SemaphoreSlim _sendLock = new SemaphoreSlim(1, 1);
         private readonly CancellationTokenSource _cts = new();
 
-        public ServerConnection( TcpClient tcpClient, ServerEntity parent, IPEndPoint remote ) {
+        public ServerConnection( TcpClient tcpClient, MistoxServer parent, IPEndPoint remote ) {
             _parent = parent;
             _remoteAddress = remote;
             _client = tcpClient;
             _client.NoDelay = true;
             _client.ReceiveTimeout = _parent.ConnectionTimeoutSeconds * 1000;
 
-            ServerInterface.ServerInstance.InvokeUserConnected( this );
+            _parent.InvokeUserConnected( this );
             // Start the receive thread
             Task.Run(ReceiveThread);
         }