Feature: #77349 - Additional locations for extension icons

See Issue #77349

Description

Extensions can now hold their extension icons in additional locations to the existing ones (ext_icon.png, ext_icon.svg, ext_icon.gif):

  • Resources/Public/Icons/Extension.png
  • Resources/Public/Icons/Extension.svg
  • Resources/Public/Icons/Extension.gif

This makes it possible to restrict access to more directories, thus hardening the TYPO3 instance.