There are edge cases where requests to certain hosts timeout when
using the vanilla HTTP.rb gem, which the goldfinger gem uses. Now
that we no longer need to support OStatus servers, webfinger logic
is so simple that there is no point encapsulating it in a gem, so
we can just use our own Request class. With that, we benefit from
more robust timeout code and IPv4/IPv6 resolution.
Fix#14091
* Add request spec for host meta route returning xml
* Add routing spec for xrd routes
* Update well-known routes
* Move webfinger and host-meta actions to their own controllers
* Add basic coverage for settings/exports controller
* Remove unused @account variable from settings/exports controller
* Add coverage for download export actions
* Remove deprecated `render :text` in favor of `send_data` for csv downloads
* Add model to handle exports
* Use Export class in settings/exports controller
* Simplify settings/exports controller methods
* Move settings/export to more restful routes
Eugen Rochko