* Move ActivityPub::FetchRemoteAccountService to ActivityPub::FetchRemoteActorService
ActivityPub::FetchRemoteAccountService is kept as a wrapper for when the actor is
specifically required to be an Account
* Refactor SignatureVerification to allow non-Account actors
* fixup! Move ActivityPub::FetchRemoteAccountService to ActivityPub::FetchRemoteActorService
* Refactor ActivityPub::FetchRemoteKeyService to potentially return non-Account actors
* Refactor inbound ActivityPub payload processing to accept non-Account actors
* Refactor inbound ActivityPub processing to accept activities relayed through non-Account
* Refactor how Account key URIs are built
* Refactor Request and drop unused key_id_format parameter
* Rename ActivityPub::Dereferencer `signature_account` to `signature_actor`
* Remove “protocol” argument and return value, as only ActivityPub is supported
* Remove FetchRemoteAccountService, only use ActivityPub::FetchRemoteAccountService
* Fix tests
* Add support for an instance actor
* Skip username validation for local Application accounts
* Add migration script to create instance actor
* Make Codeclimate happy
* Switch to id -99 for instance actor
* Remove unused `icon` and `image` attributes from instance actor
* Use if/elsif/else instead of return + ternary operator
* Add instance actor to fresh installs
* Use instance actor as instance representative
Use instance actor for forwarding reports, relay operations, and spam
auto-reporting.
* Seed database in test environment
* Fix single-user mode
* Fix tests
* Fix specs to accomodate for an extra `Account`
* Auto-reject follows on instance actor
Following an instance actor might make sense, but we are not handling that
right now, so auto-reject.
* Fix webfinger lookup and serialization for instance actor
* Rename instance actor
* Make it clear in the HTML view that the instance actor should not be blocked
* Raise cache time for instance actor as there's no dynamic content
* Re-use /about/more with a flash message for instance actor profile
