Plugin API: Add html2text hook (backport from master)

Aleksander Machniak

2016-04-15 ead084693499934c467ca6a9c396367ac661dd61

 program/steps/mail/func.inc

@@ -884,8 +884,7 @@
            $data['body'] = rcube_enriched::to_html($data['body']);
        }

        $txt  = new rcube_html2text($data['body'], false, true);
        $body = $txt->get_text();
        $body = $RCMAIL->html2text($data['body']);
        $part->ctype_secondary = 'plain';
    }
    // text/html