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/Lr/ILocationResolverManager.cs

@@ -9,13 +9,13 @@ namespace Ryujinx.HLE.HOS.Services.Lr
 
         [Command(0)]
         // OpenLocationResolver()
-        private long OpenLocationResolver(ServiceCtx context)
+        private ResultCode OpenLocationResolver(ServiceCtx context)
         {
             StorageId storageId = (StorageId)context.RequestData.ReadByte();
 
             MakeObject(context, new ILocationResolver(storageId));
 
-            return 0;
+            return ResultCode.Success;
         }
     }
 }