Since PHP 8.4 implicitly nullable parameter types are deprecated. Normalize scoped PHPDoc for nullable-parameter updates: use `?Type` instead of `Type|null` and remove column alignment. Co-authored-by: "Eric Lippmann <eric.lippmann@icinga.com>"
Add SPDX license headers and mark source files as GPL-3.0-or-later to preserve the option to relicense under later GPL versions.
Without all the Icinga 1.x burden and weird work-arounds.