[TASK] Make TYPO3 Core PSR-2 standard compliant

In our efforts to achieve a better interoperability
with other PHP projects, the PHP code base of the
TYPO3 Core switches to the PHP coding guideline
standard PSR-2.

See http://www.php-fig.org/psr/psr-2/ for more
information.

Resolves: #70515
Releases: master
Change-Id: I734c0d838af157003decfeb5fc0a11dddcb87bf5
Reviewed-on: http://review.typo3.org/43918


Reviewed-by: TYPO3 Release Team <typo3cms@typo3.org>
Tested-by: TYPO3 Release Team <typo3cms@typo3.org>