* Consistent license message for all the go files
* Fixing the last set of unconsistencies with the license headers
* Addressing PR review comments
* Fixing busy.go and busy_test.go license header
* Remove NotificationRegistry table and use structured logging
* Fix ackId for notification sent
* Notification logger at server level
* Remove unused i18n strings
* refactor utils/config* to config/
* pull validateLdapFilter into app
* clean up Config/GetConfig/GetSanitizedConfig usage
Eliminate app.GetConfig() in favour of just using app.Config() directly,
but expose app.GetSanitizedConfig() for when the old behaviour was
required.
* web: isolate config setup
* TestInvitePeopleProvider: make config explicit
* regenerateClientConfig: avoid racey map access
* integrate watch flag into app.ConfigFile option
* make app.Option return an error
* release.mk: only cp static files from config/
* release.mk: fix cp static files from config/
* api4: TestPlugin cleanup
* s/c/cfg/ for clarity
* fix merge conflict
* testlib: allow customization of testlib driver name
