* add ratelimit to /sessions; cap userAgent version length; tests
* add MaxSessionsLimit; remove oldest session first; tests
* can't use slices in 1.20; improve test
* nits
* add GetLRUSessions; move limiting to CreateSession; remove rate limiting
* use queryBuilder
* mysql needs a limit when using offset
* update i18n
* refactor into limitNumberOfSessions; protect createSessionForUserAccessToken
* add comment to GetLRUSessions
* add limit to oauth path; PR comments