[TASK] Deprecate array handling in AbstractTreeView

The array handling in AbstractTreeView has not been used
in the core for quite some while. To clean that class up
a bit, the functionality is now deprecated.

Deprecation is covered by the extension scanner, except the
class property $this->data which is too common and would
create way too many false positives.

Change-Id: I7bafdab242bf3d568c733cec669e895b87498241
Resolves: #83904
Releases: master
Reviewed-on: https://review.typo3.org/55722


Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Andreas Wolf <andreas.wolf@typo3.org>
Tested-by: Andreas Wolf <andreas.wolf@typo3.org>