We've updated the CMake files quite a bit to improve installation with vcpkg:
Use RESOURCE property to install resource files.
Add functions to inherit RESOURCE files from a library, so that they will be installed along side an application.
Change HikoGUI's path module to use separate functions for getting locations to files and directories. *_file(), *_dir(), *_dirs().
An application and the HikoGUI library can now detect if they are execution from the cmake-build directory instead of the install directory; and will automatically switch where the resource files are located.