* move loading whitelist+ops from file to auth and save the loaded files fro reloading
* add /whitelist command with lots of open questions
* add test for /whitelist
* gofmt
* use the same auth (the tests don't seem to care, but htis is more right)
* mutex whitelistMode and remove some deferred TODOs
* s/whitelist/allowlist/ (user-facing); move helper functions outside the handler function
* check for ops in Auth.CheckPublicKey and move /allowlist handling to helper functions
* possibly fix the test timeout in HostNameCollision
* Revert "possibly fix the test timeout in HostNameCollision" (didn't work)
This reverts commit 664dbb0976f8f10ea7a673950a879591c2e7c320.
* managed to reproduce the timeout after updating, hopefully it's the same one
* remove some unimportant TODOs; add a message when reverify kicks people; add a reverify test
* add client connection with key; add test for /allowlist import AGE
* hopefully make test less racy
* s/whitelist/allowlist/
* fix crash on specifying exactly one more -v flag than the max level
* use a key loader function to move file reading out of auth
* add loader to allowlist test
* minor message changes
* add --whitelist with a warning; update tests for messages
* apparently, we have another prefix
* check names directly on the User objects in TestHostNameCollision
* not allowlisted -> not allowed
* small message change
* update test
