[BUGFIX] Fail with exit code for fatal errors during boot

Especially for CI environments it is crucial that TYPO3
does not exit cleanly when a fatal error occurs.

Change from die (which exits with return code 0) to exit(1)
and send a http error code as well (in web requests)

Releases: master, 7.6
Resolves: #75280
Change-Id: I473de98366a5ea3629d968e2c1600f241b9e73a1
Reviewed-on: https://review.typo3.org/47395


Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Helmut Hummel <helmut.hummel@typo3.org>
Tested-by: Helmut Hummel <helmut.hummel@typo3.org>