* Remove Salmon and PubSubHubbub endpoints
* Add error when trying to follow OStatus accounts
* Fix new accounts not being created in ResolveAccountService
* No need to re-require sidekiq plugins, they are required via Gemfile
* Add derailed_benchmarks tool, no need to require TTY gems in Gemfile
* Replace ruby-oembed with FetchOEmbedService
Reduce startup by 45382 allocated objects
* Remove preloaded JSON-LD in favour of caching HTTP responses
Reduce boot RAM by about 6 MiB
* Fix tests
* Fix test suite by stubbing out JSON-LD contexts
* Adjust BatchedRemoveStatusService for ActivityPub
* Add tests for ActivityPub workers
* Add tests for FollowService
* Add tests for FavouriteService, UnfollowService and PostStatusService
* Add tests for ReblogService, BlockService, UnblockService, ProcessMentionsService
* Add tests for AuthorizeFollowService, RejectFollowService, RemoveStatusService
* Add tests for BatchedRemoveStatusService
* Deliver updates to a local account to ActivityPub followers
* Minor adjustments