Function tw_pack_lib::build_pack_from_filesystem

pub fn build_pack_from_filesystem(
    input_directory: &Path, 
    output_file: &mut File, 
    version: PFHVersion, 
    bitmask: PFHFlags, 
    file_type: PFHFileType, 
    pfh_timestamp: u32, 
    pack_files: &[String]
) -> Result<()>