Feature: #70002 - Make it possible to register own icons for file extensions
See forge#70002
Description
The IconRegistry has been extended with a mapping of file extensions.
Impact
It is now possible to register or overwrite the iconIdentifier for a file extension.
$iconRegistry = GeneralUtility::makeInstance(IconRegistry::class);
$iconRegistry->registerFileExtension('log', 'icon-identiifer-for-log-files');
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