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/Account/Acc/IManagerForApplication.cs

@@ -0,0 +1,40 @@
+using Ryujinx.Common.Logging;
+using Ryujinx.HLE.HOS.Services.Arp;
+using Ryujinx.HLE.Utilities;
+
+namespace Ryujinx.HLE.HOS.Services.Account.Acc
+{
+    class IManagerForApplication : IpcService
+    {
+        private UInt128                   _userId;
+        private ApplicationLaunchProperty _applicationLaunchProperty;
+
+        public IManagerForApplication(UInt128 userId, ApplicationLaunchProperty applicationLaunchProperty)
+        {
+            _userId                    = userId;
+            _applicationLaunchProperty = applicationLaunchProperty;
+        }
+
+        [Command(0)]
+        // CheckAvailability()
+        public ResultCode CheckAvailability(ServiceCtx context)
+        {
+            Logger.PrintStub(LogClass.ServiceAcc);
+
+            return ResultCode.Success;
+        }
+
+        [Command(1)]
+        // GetAccountId() -> nn::account::NetworkServiceAccountId
+        public ResultCode GetAccountId(ServiceCtx context)
+        {
+            long networkServiceAccountId = 0xcafe;
+
+            Logger.PrintStub(LogClass.ServiceAcc, new { networkServiceAccountId });
+
+            context.ResponseData.Write(networkServiceAccountId);
+
+            return ResultCode.Success;
+        }
+    }
+}