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/Fs/FileSystemProxy/IFile.cs

@@ -0,0 +1,136 @@
+using LibHac;
+using LibHac.Fs;
+using System;
+
+namespace Ryujinx.HLE.HOS.Services.Fs.FileSystemProxy
+{
+    class IFile : IpcService, IDisposable
+    {
+        private LibHac.Fs.IFile _baseFile;
+
+        public IFile(LibHac.Fs.IFile baseFile)
+        {
+            _baseFile = baseFile;
+        }
+
+        [Command(0)]
+        // Read(u32 readOption, u64 offset, u64 size) -> (u64 out_size, buffer<u8, 0x46, 0> out_buf)
+        public ResultCode Read(ServiceCtx context)
+        {
+            long position = context.Request.ReceiveBuff[0].Position;
+
+            ReadOption readOption = (ReadOption)context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4;
+
+            long offset = context.RequestData.ReadInt64();
+            long size   = context.RequestData.ReadInt64();
+
+            byte[] data = new byte[size];
+            int readSize;
+
+            try
+            {
+                readSize = _baseFile.Read(data, offset, readOption);
+            }
+            catch (HorizonResultException ex)
+            {
+                return (ResultCode)ex.ResultValue.Value;
+            }
+
+            context.Memory.WriteBytes(position, data);
+
+            context.ResponseData.Write((long)readSize);
+
+            return ResultCode.Success;
+        }
+
+        [Command(1)]
+        // Write(u32 writeOption, u64 offset, u64 size, buffer<u8, 0x45, 0>)
+        public ResultCode Write(ServiceCtx context)
+        {
+            long position = context.Request.SendBuff[0].Position;
+
+            WriteOption writeOption = (WriteOption)context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4;
+
+            long offset = context.RequestData.ReadInt64();
+            long size   = context.RequestData.ReadInt64();
+
+            byte[] data = context.Memory.ReadBytes(position, size);
+
+            try
+            {
+                _baseFile.Write(data, offset, writeOption);
+            }
+            catch (HorizonResultException ex)
+            {
+                return (ResultCode)ex.ResultValue.Value;
+            }
+
+            return ResultCode.Success;
+        }
+
+        [Command(2)]
+        // Flush()
+        public ResultCode Flush(ServiceCtx context)
+        {
+            try
+            {
+                _baseFile.Flush();
+            }
+            catch (HorizonResultException ex)
+            {
+                return (ResultCode)ex.ResultValue.Value;
+            }
+
+            return ResultCode.Success;
+        }
+
+        [Command(3)]
+        // SetSize(u64 size)
+        public ResultCode SetSize(ServiceCtx context)
+        {
+            try
+            {
+                long size = context.RequestData.ReadInt64();
+
+                _baseFile.SetSize(size);
+            }
+            catch (HorizonResultException ex)
+            {
+                return (ResultCode)ex.ResultValue.Value;
+            }
+
+            return ResultCode.Success;
+        }
+
+        [Command(4)]
+        // GetSize() -> u64 fileSize
+        public ResultCode GetSize(ServiceCtx context)
+        {
+            try
+            {
+                context.ResponseData.Write(_baseFile.GetSize());
+            }
+            catch (HorizonResultException ex)
+            {
+                return (ResultCode)ex.ResultValue.Value;
+            }
+
+            return ResultCode.Success;
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                _baseFile?.Dispose();
+            }
+        }
+    }
+}