slightly optimized FanOutOnWriteService again

Updated some translations after seeing them in service. Should be better now

We're going to want these nice helper methods, lets share them with a parent class that matches Rails 5 practices (application level abstraction)

By pushing this into a worker we can reduce the amount of time the feed manager using workers eat up a connection

This stores the @username@instance you provide in your session and
reuses it the next time you remote follow someone from this instance.

This adds the ability to filter user signup with a whitelist
instead of or in addition to a blacklist.

Fixes #817

make regeneration worker unique, (only schedule/execute once at a time)

do not re-create a dynamic class on each feed push call, make sure redis-rb uses hiredis

must be added to the Sidekiq invokation in your systemd file

The pull queue will handle link crawling, thread resolving, and OStatus
processing. Such tasks are more likely to hang for a longer time (due to
network requests) so it is more sensible to not make the "in-house" tasks
wait for them.

eanable focus on ClearColumnButton