* User directory
* Fix syncapi unit test
* Make user directory only show remote users you know about from your joined rooms
* Update sytest-whitelist
* Review comments
* Remove membership table from account DB
And make code which needs that data use the currentstate server
* Unbreak tests; use a membership enum for space
* Move filter table to syncapi where it is used
* Implement /sync `limited` and read timeline limit from stored filters
We now fully handle `room.timeline.limit` filters (in-line + stored) and
return the right value for `limited` syncs.
* Update whitelist
* Default to the default timeline limit if it's unset, also strip the extra event correctly
* Update whitelist
