[TASK] Drop extbase from install tool backend integration

Using extbase for the tiny "create enable install tool file"
backend controller makes the module more fragile than it
should be. To further stabilize and simplify the backend
integration of the install tool the controller is rewritten
and does not use extbase anymore.

Change-Id: I388376fd903e199569d464583b668fc4df0d24bc
Resolves: #72740
Releases: master
Reviewed-on: https://review.typo3.org/45945


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>