Fix GET /push_rules

Add caches to bulk_get_push_rules*

Move the AS handler out of the Handlers object.

Access it directly from the homeserver itself. It already wasn't
inheriting from BaseHandler storing it on the Handlers object was
already somewhat dubious.

Split out the room list handler

So I can use it from federation bits without pulling in all the handlers.

Only delete push actions after 30 days

Tune email notifs to make them quieter:

Fix set profile error with Requester.

 * After initial 10 minute window, only alert every 24h for room notifs
 * Reset room state after 6h of idleness
 * Synchronise throttles for messages sent in the same notif, so the 24 hourly notifs 'line up'
 * Fix the email subjects to say what triggered the notification
 * Order the rooms in reverse activity order in the email, so the 'reason' room should always come first

Replace flush_user with delete access token due to function removal
Add a new test case for if the user is already registered

There's no index on received_ts, so manually binary search using the stream_ordering index, and only update it once an hour.

Allow clients to specify a server_name to avoid 'No known servers'

Multiple server_names are supported via ?server_name=foo&server_name=bar

increment badge count per missed convo, not per msg

Move typing handler out of the Handlers object

Move the functions for parsing app service config