Xcode 8 and macOS Sierra

* Improve documentation of all _fastlane_ actions
* New [actions docs](https://docs.fastlane.tools/actions)
* Improved support for macOS Sierra
* Improved support for Xcode 8
* Improve output of `fastlane_version` action (#6393)
* Add listing of plugins and their actions in Actions.md
* Switch to new Fastlane::ROOT method to fetch gem resources
* Update `xcpretty` dependency to 0.2.3 (#6323)
* Show 💥  when a fastlane step fails
* Ignore SIGH_PROFILE_PATH when using newer api (#6347)
* Add `rake update_dependencies` to automatically update internal dependencies (#6326)
* Update internal dependencies

https://github.com/fastlane/fastlane/releases/tag/1.105.0
