Deprecation: #89554 - Deprecate \TYPO3\CMS\Extbase\Mvc\Controller\AbstractController
See forge#89554
Description
The class 
        \TYPO3\ has been marked as deprecated.
The 
        Abstract is an internal class which never really had any functionality besides
providing some basic methods for the 
        \TYPO3\. Therefore
and in order to streamline the codebase of extbase, the 
        Abstract will be removed
with TYPO3 11.0.
Impact
As all functionality of the 
        Abstract has been moved to the 
        Action there is no impact
for extbase extensions that used and extended the 
        Action.
Affected Installations
Installations that extended the 
        Abstract directly.
Migration
Extend the 
        Action.