Leave `tootctl accounts cull` to simply check removed accounts from
live domains, and skip temporarily unavailable domains, while listing
them in the final output for further action.

Add `tootctl domains purge DOMAIN` to be able to purge a domain from
that list manually

* Move more tasks to tootctl

- tootctl feeds build
- tootctl feeds clear
- tootctl accounts refresh

Clean up exit codes and help messages

* Move user modifying to tootctl

* Improve user modification through CLI, rename commands

add -> create
mod -> modify
del -> delete

To remove ambiguity

* Fix code style issues

* Fix not being able to unset admin/mod role

* If an Update is signed with known key, skip re-following procedure

Because it means the remote actor did *not* lose their database

* Add CLI method for rotating keys

    bin/tootctl accounts rotate [USERNAME]

Generates a new RSA key per account and sends out an Update activity
signed with the old key.

* Key rotation: Space out Update fan-outs every 5 minutes per 1000 accounts

* Skip suspended accounts in key rotation

bin/tootctl emoji import PATH_TO_TAR

Fix #8435

./bin/tootctl media remove --days 7 --background

Make the old rake task point to it