Many Improvements

* Introducing sub-tools, you can now run `fastlane gym` to run `gym`
* Added `repo_classifier` parameter to `nexus_upload` action
* Fix HttpForbidden and SSL connection problems on `appaloosa` action
* Make it easier to call another action from an action, you can now use `other_action.rocket` 🚀
* Added new `set_pod_key` action
* Improved default `crashlytics_path` in `crashlytics` action
* Added `use_libraries` option to `pod_push` action
* Added new `apteligent` action
* Make it possible to use `.slather.yml` on `slather` action
* Added new `Fastlane::TOOLS` constant
* Improved `crashlytics` action logging

https://github.com/fastlane/fastlane/releases/tag/1.86.0
