* ✨ (spm) add build tool plugin definition for swiftlint
* 📝 (changelog) add changelog item for the plugin
* 🐛 (cache) define cache path explicitly to avoid issues during build without issues
* 🎨 minor code cleanup
* 📝 document usage with Xcode as well as Swift packages
This will allow us to run OSSCheck on a bare metal Mac, which should
make the OSSCheck performance results more reliable than running on
virtual machines from Azure Pipelines.
Garric G. Nahapetian
Johannes Ebeling
JP Simard
Ivan Vorobei
Berik Visschers
Scott Hoyt