[FEATURE] #5014 Convert the e-mail functions to SwiftMailer

Change-Id: Ie0c276ac790290d4b0abd2e7d65a23b534908cd7
Reviewed-on: http://review.typo3.org/34107
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>