Add w3cid metadata for all editors.
I got the uids from the "Edit status" links in
https://www.w3.org/2000/09/dbwg/details?group=32061
This also updates Tab Atkins-Bittner name to current preference (since drafts disagreed).
Make specs use bikeshed's houdini templates.
These templates now exist due to
https://github.com/tabatkins/bikeshed/pull/463 , so these specs should
use them.