[TASK] Update to TypeScript 2.0

Resolves: #78430
Releases: master
Change-Id: Iba0303ebde90be0008f73f88bf9338389274d38a
Reviewed-on: https://review.typo3.org/50370


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Stefan Bürk <stefan.buerk@impactmedia.de>
Tested-by: Stefan Bürk <stefan.buerk@impactmedia.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>