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

Change default pushrules back to notifying for all messages.

Unread notification performance.

Don't error on AS non-ghost user use

This will probably go away either when we fix our existing ASes, or when
we kill the concept of non-ghost users.

I find this a lot simpler than nested try-catches and stuff

Require unbanning before other membership changes