sysutils/iocage: Fix build and runtime issues

This switches the build to pyproject.yml and hatchling to avoid
various setuptools issues.

It adds a workaround for problems with py-click, which
prevented some command line options from working properly
(especially formatting output for scripting using '-h').

While there, import small github hosted patch into the tree.

PR: 295084, 295723
Reported by: andreas@turriff.net, echoxxzz@gmail.com