Deprecation: #84414 - BackendUtility::shortcutExists
See forge#84414
Description
The PHP method 
        TYPO3\ has been marked as deprecated and will be removed with TYPO3 v10.
Impact
Installations accessing the method will trigger a PHP 
        E_ error.
Affected Installations
Instances calling the method.
Migration
Use an instance of 
        \TYPO3\ and call method 
        shortcut to get the same behavior.