Unfortunately Test::NoWarnings does not yet work properly with
"done_testing()", so it's not used where done_testing is in use.

See CPAN RT#66485 and RT#52412.

It's what I wanted initially but I forgot about where to find
blessed(). I want to be able to potentially use scalar or array refs
as parameters, too, but the check should bail out if the function is
called like a method.

Add Scalar::Util as runtime dependency.

This adds a new test and run requirement on Exporter::Easy.

This is not a run-parts feature, but things like "cat `run-parts
somedir`" are used quite often and this method offers that.

This also adds the method to t/basic-functionality.t.

Needs File::Slurp. Added to requirements accordingly.

Apparently backick-based execution does not work with forward slashes.

Also adds a test for the "run" command on DOS-ish platforms, just
based on batch files (.bat) as I don't want to include .exe or .com
files.

Run::Parts::Perl specifically accepts suffixes if running on Windows.

Also adds a specific test to test this new feature -- which runs only
on DOS-ish OS.