* dependency injection for the kafka consumers/producers

* Optionally use naffka in the monolithic server

* remember to call setupKafka()

* tweak imports

* fix integration tests

* Add use_naffka to the example config

* Update comment on the listen APIs

* Make the roomserver output format more flexible

* Fix the sync server integration testdata

* Fix roomserver testdata

* Actually fix the sync server tests

* Fix typo

* Use utility methods from gomatrixserverlib, rather than reimplementing them

* Return string rather than pointer to string

* Update gomatrixserverlib

* Add a component for sending event to remote matrix servers using federation

* Use named constants

* Comment on why we combine the deltas

* Comments

* Copyright headers!

* Fix the copy+Pasted comment

* Add tests for combineDeltas

* Review comments

* More review comments

* More comments

* Even more comments

* Name the mutexes

* Document what the mutexes are protecting

* Simplify the SQL, and more comments