Signed-off-by: NRemi Reuvekamp <git@remireuvekamp.nl>

The HTTP handlers in the components are split into reader and writer directories. This was a fairly arbitrary distinction, and turns out to not be so helpful. Most read APIs have a corresponding write API, and it is more natural for them to be in the same file rather than in different directories.

* Add contexts to device database

* Remove spurious whitespace

* Use gomatrixserverlib function to split user ID

* Propagate profile update via m.room.member events

* Send profile data on room join

* Send profile data on room creation

* Rename variable

* Move membership update to roomserver consumer

* Improve iteration

* Move event update from client API server to sync API server

* Change the way buildMembershipEvents is called

* Forbid update of someone else's profile

* Use gomatrixserverlib method

* Fix depth and previous events not being set

* Fix wrong removal in latest commit

* Update all events instead of only memberships

* Handle case where there is no state key

* Fix test