Use "interactive" instead of double-negative; allow negation via command line.

Interactive mode is still enabled by default, but you can now turn it off globally and then re-enable it case-by-case.

    "non_interactive => 0" -> "interactive => 1"
    "--non-interactive" -> "--no-interactive" (negated)

Hopefully I did everything right. I'm not very familiar with Perl.

Thanks for the great software.