* implement language tags for site/community in db and api
* add api checks for valid languages
* during db migration, update existing users, sites, communities to have all languages enabled
* init new users/communities with site languages (not all languages)
* federate site/community languages
* fix tests
* when updating site languages, limit community languages to this subset
also, when making a new post and subset of user lang, community lang
contains only one item, use that as post lang
* add tests for actor_language db functions
* include language list in siteview/communityview
* Fix some of the review comments
* Some more review changes
* Add todo about boxed query
* Add default_post_language to GetCommunityResponse
* Create example for apub lib
* some rewriting of apub lib
* Add LocalInstance struct for apub lib to avoid using Lemmy Settings
* Move ActorType trait to lemmy_apub, because its not needed in library
* Use reqwest_retry instead of custom impl, dont specify timeout on every send()
* Some improvements to example
* Moved inbox handling to library
* bug fixes
* Move context and serde helpers into library
* wip: example changes
* Add lemmy_utils feature to build only LemmyError
* Rename to activitypub_federation
* Remove lemmy_utils dep from activitypub_federation using generic error type
* Finish activitypub example
* Cleanup and fix tests
* Reorganize library files
* Remove ApubObject.to_tombstone()
* Extract activitypub library into separate git repository
* Implement instance actor
* wip: make site bans federate
* finish implementation and unit tests for federated bans
* start adding api tests
* fix api test
* remve site from GetCommunityResponse
* only federate site bans originating from user's home instance
* dont expose site.private_key in api
