Includes two modifications for WordPress:
* Removes support for NTLM in `class-smtp.php` since the required client (`extras/ntlm_sasl_client.php`) is not distributed as part of WordPress.
* Requires `class-smtp.php` for backwards compatibility with direct (non-wp_mail()) uses of PHPMailer, as the autoloader isn't used. See [27385].
This also includes a change to our `MockMailer` for unit tests. It now overrides `postSend() instead of `send()`, and `preSend()`.
`preSend()` resets `$this->Encoding` because PHPMailer doesn't clean up after itself / presets all variables. This becomes an issue when `PHPMailer::createBody()` sets `$this->Encoding = 'quoted-printable'` (away from it's default of 8bit) when it encounters a line longer than 998 characters. `Tests_Comment::test_comment_field_lengths` is such a case.
props MattyRob, dd32.
fixes#28909.
git-svn-id: https://develop.svn.wordpress.org/trunk@33124 602fd350-edb4-49c9-b593-d223f7449a82
94e3540dcc