* create visibility filter for boostability and allow self-boosting for any visbility but direct messages
* add a followers-only status to local_account_2
* fix typo in comment
* add license header, unwrap errors, be explicit about non-boostable visibility settings to avoid rogue boosting from miscoded clients, use ID compare for checking if self-boosting
* add tests for statusboostable filter
* fix tests that were affected by adding a new status to the test data
* fix the rest of tests affected by adding a status to the textrig data
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