Calls on an unresolved leaderboard are deferred Applies to: * AddScore( bool onlyIfBeatsOldScore, int score, params int[] subscores ) * AddScore( bool onlyIfBeatsOldScore, int score, int[] subscores = null, AddScoreCallback onSuccess = null, FailureCallback onFailure = null ) * AttachRemoteFile( RemoteFile file, AttachRemoteFileCallback onSuccess = null, FailureCallback onFailure = null ) * FetchScores( RequestType RequestType, int start, int end, FetchScoresCallback onSuccess, FailureCallback onFailure = null )