Create shader converters as XCFrameworks. Don't create shader converters as fat libs, dylibs, or regular frameworks. Rename create_xcframework.sh to create_xcframework_func.sh. Use separate MoltenVK packaging scripts for one or all OS's. Add package_one_os.sh. Remove package_shader_converter_lib.sh. Remove redundant GLSL shader converter dependencies in MoltenVK packaging targets.