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/BsdError.cs

@@ -1,8 +0,0 @@
-namespace Ryujinx.HLE.HOS.Services.Bsd
-{
-    //bsd_errno == (SocketException.ErrorCode - 10000)
-    enum BsdError
-    {
-        Timeout = 60
-    }
-}

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

@@ -0,0 +1,7 @@
+namespace Ryujinx.HLE.HOS.Services.Bsd
+{
+    enum BsdIoctl
+    {
+        AtMark = 0x40047307,
+    }
+}

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;
     }
 }

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

@@ -0,0 +1,28 @@
+namespace Ryujinx.HLE.HOS.Services.Bsd
+{
+    class PollEvent
+    {
+        public enum EventTypeMask
+        {
+            Input        = 1,
+            UrgentInput  = 2,
+            Output       = 4,
+            Error        = 8,
+            Disconnected = 0x10,
+            Invalid      = 0x20,
+        }
+
+        public int           SocketFd     { get; private set; }
+        public BsdSocket     Socket       { get; private set; }
+        public EventTypeMask InputEvents  { get; private set; }
+        public EventTypeMask OutputEvents { get; private set; }
+
+        public PollEvent(int SocketFd, BsdSocket Socket, EventTypeMask InputEvents, EventTypeMask OutputEvents)
+        {
+            this.SocketFd     = SocketFd;
+            this.Socket       = Socket;
+            this.InputEvents  = InputEvents;
+            this.OutputEvents = OutputEvents;
+        }
+    }
+}

Ryujinx.HLE/HOS/Services/ServiceFactory.cs

@@ -72,10 +72,10 @@ namespace Ryujinx.HLE.HOS.Services
                     return new Bcat.IServiceCreator();
 
                 case "bsd:s":
-                    return new IClient();
+                    return new IClient(true);
 
                 case "bsd:u":
-                    return new IClient();
+                    return new IClient(false);
 
                 case "caps:a":
                     return new IAlbumAccessorService();