Deprecation: #85878 - EidUtility and various TSFE methods
See forge#85878
Description
The Utility class 
        \TYPO3\ has been marked as deprecated.
The following methods have been marked as deprecated:
- TYPO3\- CMS\ - Frontend\ - Controller\ - Typo - Script - Frontend - Controller->init - FEuser - () 
- TYPO3\- CMS\ - Frontend\ - Controller\ - Typo - Script - Frontend - Controller->store - Session - Data - () 
- TYPO3\- CMS\ - Frontend\ - Controller\ - Typo - Script - Frontend - Controller->preview - Info - () 
- TYPO3\- CMS\ - Frontend\ - Controller\ - Typo - Script - Frontend - Controller->hook_ - eofe - () 
- TYPO3\- CMS\ - Frontend\ - Controller\ - Typo - Script - Frontend - Controller->add - Temp - Content - Http - Headers - () 
- TYPO3\- CMS\ - Frontend\ - Controller\ - Typo - Script - Frontend - Controller->send - Cache - Headers - () 
The following hook has been marked as deprecated:
- $GLOBALS- ['TYPO3_ - CONF_ - VARS'] - ['SC_ - OPTIONS'] - ['tslib/ - class. - tslib_ - fe. - php'] - ['hook_ - preview - Info'] 
Impact
Calling any of the methods or registering a hook listener will trigger a PHP 
        E_ error.
Affected Installations
Any TYPO3 installation with custom functionality in the frontend using any of the methods, or the hook.
Migration
As all functionality has been set up via PSR-15 middlewares, use a PSR-15 middleware instead.
The method 
        store should be replaced with 
        TSFE->fe_.
The methods 
        add and 
        send are now incorporated
within 
        TSFE->process. This function should be used, or rather add custom headers
to a PSR-15 Response object if available.
On top, the hook is superseded by the Frontend Hook hook_ which is executed in the Frontend rendering
flow directly afterwards.