Add new meta tag: Refresh

I'm not sure if this should be included as part of the base module but in the Advanced group, as a submodule or left as a separate contrib module..

This patch create a submodule that just works out of the box, avoiding yet another module https://www.drupal.org/project/refresh .
I suggest it should be shipped with the next stable release.

Patch still works for metatag 1.1 #justsaying

UPDATE: again still working for metatag 1.2
UPDATE: still working 1.4

After thinking about it, this should just be a new meta tag in the Advanced group on the base module.

Closed a duplicate: #2500293: Meta tag to start a download on page load?

Sorry for the duplicate. Did a search for "http-equiv" and "refresh", but for some reason didn't get the proper results. Maybe some filters were set, not sure.

However, yes, the advanced group is where I was looking for this meta tag and it would be great, if it would get implemented there. Don't have any experience with patches so far, but would think they are problematical, if one does Drupal updates.

I simplified it to just being a new meta tag in the Advanced group.

Committed, along with a small update for the README.txt file.

Good news - thank you very much!

Works fine thank you. The code even maintains previous values set with old patch.