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

Implement event format V2

Co-Authored-By: erikjohnston <erikj@jki.re>

Check consent dir path on startup

In future version events won't have an event ID, so we won't be able to
do this check.

We only process events sent to us from a server if the event ID matches
the server, to help guard against federation storms. We replace this
with a check against the event origin.

The transaction queue only sends out events that we generate. This was
done by checking domain of event ID, but that can no longer be used.
Instead, we may as well use the sender field.

The event ID is changing, so we can no longer get the domain from it. On
the other hand, the check is unnecessary.

Since newer versions of events don't have the same format for event ID.

Don't recommend :8448 to people on public_baseurl

Refactor event building into EventBuilder