This lets the user advertise a different port in the gopher urls,
for example listening locally on port 7070 but telling clients to
connect to the regular port 70.

Related to: mastofe!22

users to enable both strip and auto-orient

* federation (ap, salmon)
* media (rich media, media proxy)
* upload (uploader proxy)

Each "part" will stop fighting others ones -- a huge federation outbound
could before make the media proxy fail to checkout a connection in time.

splitted media and uploaded media for the good reason than an upload
pool will have all connections to the same host (the uploader upstream).
it also has a longer default retention period for connections.

[ci skip]

Thanks @href!