[!!!][TASK] Early check for PHP 5.5 in Install Tool

PHP 5.5 or above is a requirement for TYPO3 CMS. As code is using
specific PHP 5.5 features, an early check is required in Install Tool.

Releases: master
Resolves: #62914
Change-Id: Ia33b5e16d5cc96edc7cad5a4348fce5fb1b1236a
Reviewed-on: http://review.typo3.org/34056
Reviewed-by: Benjamin Mack <benni@typo3.org>
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: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>