[WSSMAIL-4] Add PHPMailer support for format=flowed

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wssmail uses PHPMailer standalone on the frontend to send messages using SMTP, and PHPMailer does not currently support format=flowed, so we need to push that through so that messages are generated correctly.

/* Create a format=flowed plain text body (RFC 3676 - 4.2) */
$ffbody = "";
$line = strtok($body, "\n");
while ($line !== false) {
    rtrim($line); /* Trim spaces before user line breaks */
    if (substr($line, -1) === "\r") {
        /* Also strip CR if present */
        $line = substr($line, 0, -1);
    }
    /* Need to space stuff.
     * Could use str_starts_with, but use substr for <8 compatibility */
    if (substr($line, 0, 1) === " " || substr($line, 0, 4, "From") || substr($line, 0, 1, ">")) {
        $line = " " . $line;
    }
    /* Now it's deterministic
     * Wrap each line at 76 characters, with a space after to make it format=flowed.
     */
    $line = wordwrap($line, 76, " \r\n");
    $ffbody .= $line . "\r\n";
    $line = strtok("\n");
}

Once that is upstreamed and integrated, perhaps we can submit wssmail as an example here: https://useplaintext.email/#thunderbird (evergreen could also be included)

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