* Update IAccountService and IManagerForApplication `IAccountService`: - Add symbols. - Fix some mistake. - Add `IsUserRegistrationRequestPermitted` and `TrySelectUserWithoutInteraction`. `IManagerForApplication`: - Add symbols. - Add Uuid args. - Little improvement of `GetAccountId`
* save common implementation * remove zero userid check * Renamed UserId to UInt128 * fix index in hex conversion
* implement loading of profile image * rename icon to profilepicture * rename icon file