Refactoring result codes (#731)

* refactoring result codes

- Add a main enum who can handle some orphalin result codes and the default `ResultCode.Success` one.
- Add sub-enum by services when it's needed.
- Remove some empty line.
- Recast all service calls to ResultCode.
- Remove some unneeded static declaration.
- Delete unused `NvHelper` class.

* NvResult is back

* Fix

Ryujinx.HLE/HOS/Services/Acc/ResultCode.cs

@@ -0,0 +1,20 @@
+namespace Ryujinx.HLE.HOS.Services.Acc
+{
+    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
+    }
+}