Add cmdline script

[jenskutilek]

Maybe it would be nice to add a simple command line interface?

$ extractufo ~/font1.otf ~/font2.ttf

Not sure, because it adds a ufoLib2 dependency.

[moyogo]

Maybe have a --ufo-module argument like glyphs2ufo

    parser_glyphs2ufo.add_argument(
        "--ufo-module",
        metavar="UFO_MODULE",
        choices=("ufoLib2", "defcon"),
        default="ufoLib2",
        help=(
            "Select the default library for writing UFOs. Choose between: %(choices)s "
            "(default: %(default)s)"
        ),
    )

[typemytype]

adding a dependency is not nice

but adding a command line tool would make it more accessible outside