* Try to process rooms concurrently in FS /send
* Clean up
* Use request context so that dead things don't linger for so long
* Remove mutex
* Free up pdus slice so only references remaining are in channel
* Revert "Remove mutex"
This reverts commit 8558075e8c.
* Process EDUs in parallel
* Try refactoring /send concurrency
* Fix waitgroup
* Release on waitgroup
* Respond to transaction
* Reduce CPU usage, fix unit tests
* Tweaks
* Move into one file