Added <h4> and <hr> to communicator email

Added <h4> and <hr> to communicator email template and made sure
subfooter links are underlined.
Added table of contents to communicator template

Added table of contents to communicator template.
Removed text size adjust from communicator

Removed text size adjust from communicator template.
Cleaning up the communicator template

Making a bunch of tweaks to clean up the communicator template to get
it to work right in older email clients.
Still working on the communicator template

Lots of tweaks trying to get the email to work in most clients. Added
arrow right to the subfooter and tweaked the banner image.
Cleaning up send_ua_eng_email()

Make sure each $href is set. Escape the new href to use with
attributes. And make sure we’re replacing the correct href.