* 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
* Refactoring of acc:u0
- Move all account things to the account service
- More accurate IAccountServiceForApplication
- Add helper to UInt128
* FIx my engrish
* FIx my engrish #2