Deprecation: #79364 - Deprecate members in PageLayoutController 

See forge#79364

Description 

Deprecate the members \TYPO3\CMS\Backend\Controller\PageLayoutController::edit_record and \TYPO3\CMS\Backend\Controller\PageLayoutController::new_unique_uid.

Impact 

Installation of EXT:compatibility7 is required to continue using this members until they are removed in TYPO3 v9.

Affected Installations 

Any installation using the mentioned members \TYPO3\CMS\Backend\Controller\PageLayoutController::edit_record and \TYPO3\CMS\Backend\Controller\PageLayoutController::new_unique_uid.