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/ResultCode.cs

@@ -0,0 +1,20 @@
+namespace Ryujinx.HLE.HOS.Services.Account
+{
+    enum ResultCode
+    {
+        ModuleId       = 124,
+        ErrorCodeShift = 9,
+
+        Success = 0,
+
+        NullArgument                         = (20  << ErrorCodeShift) | ModuleId,
+        InvalidArgument                      = (22  << ErrorCodeShift) | ModuleId,
+        NullInputBuffer                      = (30  << ErrorCodeShift) | ModuleId,
+        InvalidInputBufferSize               = (31  << ErrorCodeShift) | ModuleId,
+        InvalidInputBuffer                   = (32  << ErrorCodeShift) | ModuleId,
+        ApplicationLaunchPropertyAlreadyInit = (41  << ErrorCodeShift) | ModuleId,
+        UserNotFound                         = (100 << ErrorCodeShift) | ModuleId,
+        NullObject                           = (302 << ErrorCodeShift) | ModuleId,
+        UnknownError1                        = (341 << ErrorCodeShift) | ModuleId
+    }
+}