2026-February-18 - 2.7.15411

Refactor Resource Loading to handle unlikely filenames (#14118)

* Refactor Resource Loading to handle unlikely filenames

Hardens resource path creation.

Allows construction of createResourcePathStrings for resources with file names containing characters not allowed on Windows. These files, such as "Hebei / Peking.png" cannot exist on Windows.

Adds tests to verify this functionality, as well as additional ResourceLoader test coverage.

* Update and cleanup based on review feedback

---------

Co-authored-by: frigoref <frigoref@web.de>