* Groundwork for send-to-device messaging
* Update sample config
* Add unstable routing for now
* Send to device consumer in sync API
* Start the send-to-device consumer
* fix indentation in dendrite-config.yaml
* Create send-to-device database tables, other tweaks
* Add some logic for send-to-device messages, add them into sync stream
* Handle incoming send-to-device messages, count them with EDU stream pos
* Undo changes to test
* pq.Array
* Fix sync
* Logging
* Fix a couple of transaction things, fix client API
* Add send-to-device test, hopefully fix bugs
* Comments
* Refactor a bit
* Fix schema
* Fix queries
* Debug logging
* Fix storing and retrieving of send-to-device messages
* Try to avoid database locks
* Update sync position
* Use latest sync position
* Jiggle about sync a bit
* Fix tests
* Break out the retrieval from the update/delete behaviour
* Comments
* nolint on getResponseWithPDUsForCompleteSync
* Try to line up sync tokens again
* Implement wildcard
* Add all send-to-device tests to whitelist, what could possibly go wrong?
* Only care about wildcard when targeted locally
* Deduplicate transactions
* Handle tokens properly, return immediately if waiting send-to-device messages
* Fix sync
* Update sytest-whitelist
* Fix copyright notice (need to do more of this)
* Comments, copyrights
* Return errors from Do, fix dendritejs
* Review comments
* Comments
* Constructor for TransactionWriter
* defletions
* Update gomatrixserverlib, sytest-blacklist
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