Cache dns lookups, and use the cache if we fail to lookup servers later

Remove member event rule as per SYN-607

Push badge counts

Don't explode when given a unicode username in /register/

Whine if we give a from param to /sync

Allow non-guests to peek on rooms using /events

Add storage function to get all receipts for a user. Also add some cache invalidation to the receipts storage because there wasn't any, and remove a method that was unused.

Don't generate push actions for our own events

Only compute unread notifications for rooms we send down stream

Push actions perf

Add regex cache. Only caculate push actions for users that have sent read receipts, and are on that server

Don't log urlencoded access_tokens

Return highlight_count in /sync