Refactoring HOS folder structure (#771)

* Refactoring HOS folder structure

Refactoring HOS folder structure:

- Added some subfolders when needed (Following structure decided in private).
- Added some `Types` folders when needed.
- Little cleanup here and there.
- Add services placeholders for every HOS services (close #766 and #753).

* Remove Types namespaces

Ryujinx.HLE/HOS/Services/Sockets/Bsd/ServerInterface.cs

@@ -0,0 +1,8 @@
+namespace Ryujinx.HLE.HOS.Services.Sockets.Bsd
+{
+    [Service("bsdcfg")]
+    class ServerInterface : IpcService
+    {
+        public ServerInterface(ServiceCtx context) { }
+    }
+}

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

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

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

@@ -0,0 +1,13 @@
+using System.Net.Sockets;
+
+namespace Ryujinx.HLE.HOS.Services.Sockets.Bsd
+{
+    class BsdSocket
+    {
+        public int Family;
+        public int Type;
+        public int Protocol;
+
+        public Socket Handle;
+    }
+}

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

@@ -0,0 +1,28 @@
+namespace Ryujinx.HLE.HOS.Services.Sockets.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)
+        {
+            SocketFd     = socketFd;
+            Socket       = socket;
+            InputEvents  = inputEvents;
+            OutputEvents = outputEvents;
+        }
+    }
+}