* [feature] Federate interaction policies + Accepts; enforce policies
* use Acceptable type
* fix index
* remove appendIRIStrs
* add GetAccept federatingdb function
* lock on object IRI
* [feature] serdes for moved/also_known_as
* document `alsoKnownAs` and `movedTo` properties
* only implicitly populate AKA uris from DB for local accounts
* don't let remotes store more than 20 AKA uris to avoid shenanigans
* [feature] Federate status language in + out
* go fmt
* tests, little fix
* improve comments
* unnest a bit
* avoid unnecessary nil check
* use more descriptive variable for contentMap
* prefer instance languages when selecting from contentMap
* update docs to reflect lang selection
* rename rdfLangString -> rdfLangs
* update comments to mention Pollable
* iter through slice instead of map
