Add mailgun options, more iPad options for snapshot, bugfixes & more...

* [gym] Revert library support, fixes #7630 (#7631)
* [spaceship] Fix path to referenced fastfile (#7604)
* [fastlane action] Support mailgun reply_to (#7605)
* [fastlane] Anonymize sensitive options for captured_output (#7335)
* [snapshot] Add additional ipad classifiers. (#7570)

https://github.com/fastlane/fastlane/releases/tag/2.2.0
