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/Settings/ISettingsServer.cs

@@ -0,0 +1,109 @@
+using Ryujinx.Common.Logging;
+using Ryujinx.HLE.HOS.SystemState;
+using System;
+
+namespace Ryujinx.HLE.HOS.Services.Settings
+{
+    [Service("set")]
+    class ISettingsServer : IpcService
+    {
+        public ISettingsServer(ServiceCtx context) { }
+
+        [Command(0)]
+        // GetLanguageCode() -> nn::settings::LanguageCode
+        public ResultCode GetLanguageCode(ServiceCtx context)
+        {
+            context.ResponseData.Write(context.Device.System.State.DesiredLanguageCode);
+
+            return ResultCode.Success;
+        }
+
+        [Command(1)]
+        // GetAvailableLanguageCodes() -> (u32, buffer<nn::settings::LanguageCode, 0xa>)
+        public ResultCode GetAvailableLanguageCodes(ServiceCtx context)
+        {
+            return GetAvailableLanguagesCodesImpl(
+                    context,
+                    context.Request.RecvListBuff[0].Position,
+                    context.Request.RecvListBuff[0].Size,
+                    0xF);
+        }
+
+        [Command(2)] // 4.0.0+
+        // MakeLanguageCode(nn::settings::Language language_index) -> nn::settings::LanguageCode
+        public ResultCode MakeLanguageCode(ServiceCtx context)
+        {
+            int languageIndex = context.RequestData.ReadInt32();
+
+            if ((uint)languageIndex >= (uint)SystemStateMgr.LanguageCodes.Length)
+            {
+                return ResultCode.LanguageOutOfRange;
+            }
+
+            context.ResponseData.Write(SystemStateMgr.GetLanguageCode(languageIndex));
+
+            return ResultCode.Success;
+        }
+
+        [Command(3)]
+        // GetAvailableLanguageCodeCount() -> u32
+        public ResultCode GetAvailableLanguageCodeCount(ServiceCtx context)
+        {
+            context.ResponseData.Write(Math.Min(SystemStateMgr.LanguageCodes.Length, 0xF));
+
+            return ResultCode.Success;
+        }
+
+        [Command(5)]
+        // GetAvailableLanguageCodes2() -> (u32, buffer<nn::settings::LanguageCode, 6>)
+        public ResultCode GetAvailableLanguageCodes2(ServiceCtx context)
+        {
+            return GetAvailableLanguagesCodesImpl(
+                    context,
+                    context.Request.ReceiveBuff[0].Position,
+                    context.Request.ReceiveBuff[0].Size,
+                    SystemStateMgr.LanguageCodes.Length);
+        }
+
+        [Command(6)]
+        // GetAvailableLanguageCodeCount2() -> u32
+        public ResultCode GetAvailableLanguageCodeCount2(ServiceCtx context)
+        {
+            context.ResponseData.Write(SystemStateMgr.LanguageCodes.Length);
+
+            return ResultCode.Success;
+        }
+
+        [Command(8)] // 5.0.0+
+        // GetQuestFlag() -> bool
+        public ResultCode GetQuestFlag(ServiceCtx context)
+        {
+            context.ResponseData.Write(false);
+
+            Logger.PrintStub(LogClass.ServiceSet);
+
+            return ResultCode.Success;
+        }
+
+        public ResultCode GetAvailableLanguagesCodesImpl(ServiceCtx context, long position, long size, int maxSize)
+        {
+            int count = (int)(size / 8);
+
+            if (count > maxSize)
+            {
+                count = maxSize;
+            }
+
+            for (int index = 0; index < count; index++)
+            {
+                context.Memory.WriteInt64(position, SystemStateMgr.GetLanguageCode(index));
+
+                position += 8;
+            }
+
+            context.ResponseData.Write(count);
+
+            return ResultCode.Success;
+        }
+    }
+}