[CLEANUP] Tree Classes

This patch is cleaning up the tree classes where properties
were set via the init() function and are now handled
by class properties, overriding the parent properties, itself.
A function not needed in the AbstractTreeView has been removed.

Resolves: #68005
Releases: master
Change-Id: I6fad1ade76c015a60ccdef77c5a8b4251f3f12da
Reviewed-on: http://review.typo3.org/41036


Reviewed-by: Benjamin Mack <benni@typo3.org>
Tested-by: Benjamin Mack <benni@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>