account: Implement IManagerForApplication calls and IAsyncContext (#1466)

* account: Implement IManagerForApplication calls and IAsyncContext

This implement:
- IManagerForApplication::EnsureIdTokenCacheAsync (accordingly to RE) but the Async task is stubbed.
- IAsyncContext interface (accordingly to RE).
- IManagerForApplication::LoadIdTokenCache (checked with RE, and stubbed).

I've tried some games but now they needs some `sfdnsres` calls, some other boots and crashes with other issues.
Maybe we should disable the connection somewhere to lets the game think we are offline. I have done many attempts, without success, but since the code is here now, it's better than nothing.

(I've cleaned up `using` of IGeneralService too)

Closes #629 and closes #630

* change AccountId

* Fix gdkchan's comments

* use CompletedTask

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

@@ -12,10 +12,12 @@ namespace Ryujinx.HLE.HOS.Services.Account
         NullInputBuffer                      = (30  << ErrorCodeShift) | ModuleId,
         InvalidInputBufferSize               = (31  << ErrorCodeShift) | ModuleId,
         InvalidInputBuffer                   = (32  << ErrorCodeShift) | ModuleId,
-        ApplicationLaunchPropertyAlreadyInit = (41  << ErrorCodeShift) | ModuleId,
+        AsyncExecutionNotInitialized         = (40  << ErrorCodeShift) | ModuleId,
+        Unknown41                            = (41  << ErrorCodeShift) | ModuleId,
         InternetRequestDenied                = (59  << ErrorCodeShift) | ModuleId,
         UserNotFound                         = (100 << ErrorCodeShift) | ModuleId,
         NullObject                           = (302 << ErrorCodeShift) | ModuleId,
-        UnknownError1                        = (341 << ErrorCodeShift) | ModuleId
+        Unknown341                           = (341 << ErrorCodeShift) | ModuleId,
+        InvalidIdTokenCacheBufferSize        = (451 << ErrorCodeShift) | ModuleId
     }
 }