* Remove Client Auth as an explicit option (it's on by default).
* Update wording about Public mode
* Fix tuple error when raising TorTooOldStealth exception in CLI
* Move Private Key button next to URL button in GUI
* Replace visual references of ClientAuth to Private Key
* Remove HTTPAuth Flask dependency and remove a lot of code to do with password generation,
401 auth triggers/invalid password rate limit detection etc
* Test updates
* Remove obsolete locale keys
This commit basically just adds the codes from the PR
https://github.com/micahflee/onionshare/pull/804/commits
on the newly structured and refactored code and also
fixes import dependencies and changed any code that was
relevant with the new code of onionshare
