Request: Only match issues with a label

[flying-sausages]

I'd like to make sure that the template is only checked for issues made from that template. We disable blank issues from being made already. However, when converting items from projects to issues, or when using line references to create new issues, the template isn't there and so it will always auto-close.

Anyway, it might be nice to let people "require" certain tags that they specify in the template, so that some issues that are intended to can slip by just fine.