test threepid checking

start.sh: Fix the --no-rate-limit option for messages

start.sh: Fix the --no-rate-limit option for messages and make it bypass rate limit on registration and login too.

Collect all the things that make room-versions different to one another into
one place, so that it's easier to define new room versions.

Feature/fix small stuff in docker readme.md

Signed-off-by: Jurrie Overgoor <1213142+Jurrie@users.noreply.github.com>

Signed-off-by: Jurrie Overgoor <1213142+Jurrie@users.noreply.github.com>

Combine the CurrentStateDeltaStream into the EventStream

Refactors to replication stream row update/parsing

Remove log line for password.

This PR allows password provider modules to bind email addresses when a user is registering and is motivated by matrix-org/matrix-synapse-ldap3#58

Use event streams to calculate presence

Split up replication.tcp.streams into smaller files

... as a precursor to combining it with the CurrentStateDelta stream.

We're about to turn it straight into a JSON object anyway so building a
ROW_TYPE is a bit pointless, and reduces flexibility in the update_function.

This will allow individual stream classes to override how a row is parsed.

Primarily this fixes a bug in the handling of remote users joining a
room where the server sent out the presence for all local users in the
room to all servers in the room.

We also change to using the state delta stream, rather than the
distributor, as it will make it easier to split processing out of the
master process (as well as being more flexible).

Finally, when sending presence states to newly joined servers we filter
out old presence states to reduce the number sent. Initially we filter
out states that are offline and have a last active more than a week ago,
though this can be changed down the line.

Fixes #3962

Adds a new method, check_3pid_auth, which gives password providers
the chance to allow authentication with third-party identifiers such
as email or msisdn.

Redo of https://github.com/matrix-org/synapse/pull/4840