fix: IP support on opt-in and opt-out lists

[ghost]

fixes #944

[jessicaschilling]

@lidel - might you have time for a review? Thanks!

[lidel]

Thank you @Sierra410!

ps. I noticed potential problems with IPv6 and inlined custom ports, so I've added additional normalization/tests for those scenarios. Should be robust enough now to handle anything you throw at it :-)

[ghost]

x => isFQDN(x) || isIP.v4(x) || (!isIP.v6(x) && isIP.v6(x.replace(/[[\]]+/g, '')))

This will report malformed IPv6s like ]::1[ or [:[:[1[ as valid.

It should be more like this:

function isHostname(x) {
	if (isFQDN(x) || isIP.v4(x))
		return true
	
	const match = x.match(/^\[(.*)\]$/)
	
	if (match == null)
		return false
	
	return isIP.v6(match[1])
}