Breaking: #73611 - Removed ResourceCompressor relative path methods 

See forge#73611

Description 

The methods ResourceCompressor::setInitialPaths() and ResourceCompressor::setRelativePath() have been removed.

Impact 

Calling one of the methods above will result in a fatal PHP error.

Affected Installations 

Any TYPO3 instance with custom extensions manually using the ResourceCompressor instead of using the PageRenderer API.

Migration 

Simply remove the methods from the affected code, as these methods are not needed anymore. All calculations for the paths are now done automatically.