Update name/email/url
This builds on !2040 (merged)
Not fully done - I left one instance of my old email in there because I don't have a new PGP key for my new work email, and I'm apparently the security contact because I'm the one who uses PGP :) OK I have an OpenPGP key for my new work email now.
While I was at it, I built a mailmap file with more than just me in it: we have a mostly tidy commit log with mostly tidy committers, but there were a few I could coalesce or clean up.
Edited by Rylie Pavlik