* First pass at server ACLs (not efficient)
* Use transaction origin, update whitelist
* Fix federation API test
It's sufficient for us to return nothing in response to current state, so that the server ACL check returns no ACLs.
* More efficient server ACLs - hopefully
* Fix queries
* Fix queries
* Avoid panics by nil pointers
* Bug fixes
* Fix state event type
* Fix mutex
* Update logging
* Ignore port when matching servername
* Use read mutex
* Fix bugs
* Fix sync API test
* Comments
* Add tests, tweaks to behaviour
* Fix test output
* Add InputDeviceListUpdate
* Unbreak unit tests
* Process inbound device list updates from federation
- Persist the keys in the keyserver and produce key changes
- Does not currently fetch keys from the remote server if the prev IDs are missing
* Linting
* Add QueryDeviceMessages to serve up device keys and stream IDs
* Consume key change events in fedsender
Don't yet send them to destinations as we haven't worked them out yet
* Send device list updates to all required servers
* Glue it all together
* Recheck device lists when join/leave events come in
* Add PerformDeviceDeletion
* Notify clients when devices are deleted
* Unbreak things
* Remove debug logging
