Updated SwiftMailer(4.xx) component with attachments and plugins

This version of SwiftMailer component is built under cake conventions and has ability to add attachments, plugins and SMTP under TLS or SSL. Also if you are using utf-8 characters Outlook uses different encoding for subject, so there is a possibility to change encoding for both: subject and message.

In this version message is wrapped like in cake's email component etc. email element is wrapped in the email layout for a content type used. I must mention that SwiftMailer library is under GPL license.

Thanks to Matt Huggins who was first to make this component under SwiftMailer version 3.xx