Kaba class Storage ed

class Storage
    var current_directory: Path

    # constructors
    func mut __init__()

    # functions
    func load(out s: Song, filename: Path) -> future[void]
    func load_buffer(filename: Path) -> future[AudioBuffer]
    func save(s: Song&, filename: Path) -> future[void]
    func save_via_renderer(source: OutPort, filename: Path, num_samples: i32, tags: Tag[]) -> future[void]