Function ul_sys::ulSettingsSetFileSystemPath

pub unsafe extern "C" fn ulSettingsSetFileSystemPath(
    settings: ULSettings, 
    path: ULString
)

Set the root file path for our file system, you should set this to the relative path where all of your app data is.

This will be used to resolve all file URLs, eg file:///page.html

@note By default, on macOS we use the app bundle's @resource_path, on all other platforms we use the "./assets/" directory relative to the executable's directory.