IPv6 Support

@d4t3r: Have you tried the patch? This feature needs people to test the patch and review it.

#10 is the current patch for 2.0.x
#6 is the current patch for 7.x-1.x. It needs to be re-rolled because it no longer applies. I don't know what #13 is or how it differs from #6.

Neither patch has a hook_update_N() that updates the database schema on existing sites. This is required.

Neither patch has a test for the update hook to ensure that the update does the right thing on existing sites. This is also required.

You can help by reviewing the patch, re-rolling the D7 patch and ensuring it's consistent with the 2.0.x patch, fixing the update hook, writing the update tests, or even documenting how you are using this feature.

Thanks for your efforts here! I have re-rolled the patch so it works with the latest 2.0.1.

I created a MR from the patch in #16.

Although, since #16 doesn't have an interdiff, I don't know whether it's a re-roll of #10 or what?

Regardless, this is still "Needs work" because, like I said in #15, this NEEDS a HOOK_UPDATE_N() to update the schema on existing sites and NEEDS AN UPDATE TEST to demonstrate the update hook works properly (see tests/src/Functional/Update/Ip2CountryUpdateTest.php for an example of how to write this test).

I'm going to touch up the MR a bit depending on what GitLab CI says, but I'm not going to be writing the missing hook or the test for the missing hook at this time.

Everything seems to work except for what I mentioned in #19.