Open external links in a new tab or window

Thanks for suggesting this feature, and sorry for the long delay!
I don’t think it is a universal requirement that external links should open in a new tab. Therefore, this would definitely need to be an option in the UI.
Also, there doesn’t seem to be much demand for this feature, so I’d first wait whether there is even any interest in this being added before proceeding to implement the config form.

NW for adding an option and the tests.
As said, though, I think we should first wait whether there is enough interest.

spicy.werewolf → made their first commit to this issue’s fork.

I updated the code to work with the latest version. Mostly because we still have a site using it.