[BUGFIX] Fix output of DebugUtility

This change prettifies the output of the debug output
methods, by using the Extbase DebuggerUtility for that purpose.

The benefits are consistent, well readable, properly encoded output
for every case the class provides.

In the long run, this class should be replaced with
a more object oriented approach.

Resolves: #76302
Releases: master, 7.6
Change-Id: Iacbb48701f6c98139bd7db86795952a123e076da
Reviewed-on: https://review.typo3.org/48288


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Helmut Hummel <helmut.hummel@typo3.org>
Tested-by: Helmut Hummel <helmut.hummel@typo3.org>