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/Bcat/IServiceCreator.cs

@@ -10,24 +10,24 @@ namespace Ryujinx.HLE.HOS.Services.Bcat
 
         [Command(0)]
         // CreateBcatService(u64, pid) -> object<nn::bcat::detail::ipc::IBcatService>
-        public long CreateBcatService(ServiceCtx context)
+        public ResultCode CreateBcatService(ServiceCtx context)
         {
             long id = context.RequestData.ReadInt64();
 
             MakeObject(context, new IBcatService());
 
-            return 0;
+            return ResultCode.Success;
         }
 
         [Command(1)]
         // CreateDeliveryCacheStorageService(u64, pid) -> object<nn::bcat::detail::ipc::IDeliveryCacheStorageService>
-        public long CreateDeliveryCacheStorageService(ServiceCtx context)
+        public ResultCode CreateDeliveryCacheStorageService(ServiceCtx context)
         {
             long id = context.RequestData.ReadInt64();
 
             MakeObject(context, new IDeliveryCacheStorageService());
 
-            return 0;
+            return ResultCode.Success;
         }
     }
-}
+}