helps prevent collisions. See: - https://developer.android.com/studio/projects/android-library - https://stackoverflow.com/questions/16350957/why-android-cannot-deal-with-resources-name-conflict-between-project-and-library - https://www.ittybittyapps.com/blog/2020-11-06-understanding-resource-conflicts-in-android/ - https://stackoverflow.com/questions/41863628/how-to-make-android-library-resources-private