"Check-in" with pub.orcid.org

- When an ORCID is submitted by user, either in a comments form or in the Admin panel, the plugin now tries to grab the full profile from pub.orcid.org

- What we can do with this info:
(1) replace numbers with names on the client-facing side (according to Settings)
(2) validate comments automatically if they link to a real ORCID profile (not foolproof of course but should eliminate the vast majority of comment spam)

- When an ORCID is typed in by the user, their browser will also check with pub.orcid.org and make sure that it links to a real profile. They can still submit even if this check fails, but it will help them check that they've got the right thing entered.