Server capabilities support

* Fix replication for room v3

We were not correctly quoting the path fragments over http replication,
which meant that it exploded when the event IDs had a slash in them

* Newsfile

* Handle listening for ACME requests on IPv6 addresses

the weird url-but-not-actually-a-url-string doesn't handle IPv6 addresses
without extra quoting. Building a string which you are about to parse again
seems like a weird choice. Let's just use listenTCP, which is consistent with
what we do elsewhere.

* Clean up the default ACME config

make it look a bit more consistent with everything else, and tweak the defaults
to listen on port 80.

* newsfile

Fix bug where synapse fails to start if no_tls set

Tiny .well-known fixes

Merge branch 'neilj/room_capabilities' of github.com:matrix-org/synapse into neilj/room_capabilities

Implement workaround for login error.

Signed-off-by: Robert Jacob <xperimental@solidproject.de>

Enable support for room version 3

Implement rechecking of redactions for room versions v3

Remove usages of event ID's domain