* Add --fingerprint option
* Simplify conditional checks
* Improve warning wording
* Throw error instead of logging and returning
* --fingerprint => --serverfingerprint
* Only run fingerprint checks against main server
* Throw error if --serverfingerprint is set for a non SSL main server
* Fix linting errors
* Don't check certificate fingerprint in a seperate connection
* Disallow CA signed certs when a fingerprint is provided
* Show clear error and then exit for Qt GUI users
* Remove leading newlines from error dialog
* Always check is_main_server() when getting fingerprint
* Document how to generate SSL cert fingerprint
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