Deprecation: #77164 - ErrorpageMessage and AbstractStandaloneMessage 

See forge#77164

Description 

The two PHP classes ErrorpageMessage and AbstractStandaloneMessage have been marked as deprecated.

Impact 

Instantiating one of the PHP classes will trigger a deprecation log entry.

Affected Installations 

Any TYPO3 instance using the two PHP classes directly because of a specialized error handling or exception handling method.

Migration 

Use the new Fluid-based ErrorPageController class.