ContributionsFetcher(api: RedditApi, username: String? = null, where: String, limit: Long = DEFAULT_LIMIT, sorting: ContributionsSorting = DEFAULT_SORTING, timePeriod: TimePeriod = DEFAULT_TIMEPERIOD, disableLegacyEncoding: Boolean = false, inline getUsername: (() -> String)? = null, inline getHeader: () -> HashMap<String, String>)