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

Move SyncHandler out of the Handlers object

tune email notifs, fix CSS a bit, and add debugging details

Cleanup room member handler

Move the presence handler out of the Handlers object

Spell "domain" correctly

s/domian/domain/g

Try importing at the root level rather than conditionally importing, as per comment

Make synctl read a cache factor from config file

add a url_preview_ip_range_whitelist config param

Always set the config key with an empty list, even if a list isn't specified.
This means that the codepaths are the same for both the empty list and
for a missing key. Since the behaviour is the same for both cases this
makes the code somewhat easier to reason about.

Make email notifs work on the pusher synapse