Summary:
Port PHPMailer options. Also:
- Don't show values on config lists if they're masked (this is mostly for passwords, to prevent them from being idly/accidentally disclosed).
- Don't show "default" icon -- just show an icon if the value has been customized. This makes it easier to pick out custom values.
Test Plan: Looked at / edited mailer values.
Reviewers: codeblock, btrahan
Reviewed By: codeblock
CC: aran
Maniphest Tasks: T2255
Differential Revision: https://secure.phabricator.com/D4441
