Signed-off-by: Clifford Garwood II <cliff@cigii.com>

replace the event_info dict with an attrs thing

have_events was a map from event_id to rejection reason (or None) for events
which are in our local database. It was used as filter on the list of
event_ids being passed into get_events_as_list. However, since
get_events_as_list will ignore any event_ids that are unknown or rejected, we
can equivalently just leave it to get_events_as_list to do the filtering.

That means that we don't have to keep `have_events` up-to-date, and can use
`have_seen_events` instead of `get_seen_events_with_rejection` in the one place
we do need it.

Co-Authored-By: Erik Johnston <erik@matrix.org>

Ensure that the the default settings for the room directory are that the it is hidden from public view by default. 

(hopefully)

... and deobfuscate the relevant bit of code.

Signed-off-by: Syam G Krishnan <syamgk@gmail.com>

Implement part [MSC2228](https://github.com/matrix-org/matrix-doc/pull/2228). The parts that differ are:

* the feature is hidden behind a configuration flag (`enable_ephemeral_messages`)
* self-destruction doesn't happen for state events
* only implement support for the `m.self_destruct_after` field (not the `m.self_destruct` one)
* doesn't send synthetic redactions to clients because for this specific case we consider the clients to be able to destroy an event themselves, instead we just censor it (by pruning its JSON) in the database

Signed-Off-By: Filip Štědronský <g@regnarg.cz>

Cf #6422

Guess I only tested this on python 2 :/

Fixes #6419.

Guess I only tested this on python 2 :/

Fixes #6419.

Fix phone home stats

There are lots of words in the comment as to why this is a good idea.

Fixes #6403.