Complete rewrite of bsd IClient (#460)

This should provide accurate behaviours.
This implementation has been tested with ftpd and libtransistor bsd tests.

This implementation lacks OOB support.

Ryujinx.HLE/HOS/Services/Bsd/BsdSocket.cs

@@ -1,4 +1,3 @@
-using System.Net;
 using System.Net.Sockets;
 
 namespace Ryujinx.HLE.HOS.Services.Bsd
@@ -9,10 +8,6 @@ namespace Ryujinx.HLE.HOS.Services.Bsd
         public int Type;
         public int Protocol;
 
-        public IPAddress IpAddress;
-
-        public IPEndPoint RemoteEP;
-
         public Socket Handle;
     }
 }