cubing 0.15.2

Features from `cubing.js` in Rust.
Documentation 
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#[cfg(test)]
mod tests {
    use std::sync::Arc;

    use cubing::alg::{Alg, Move, MoveLayer, MovePrefix, MoveRange, QuantumMove};
    use cubing_macros::{parse_alg, parse_move};

    #[test]
    fn parse_move() {
        let r#move: &Move = parse_move!("R");
        assert_eq!(&"R".parse::<Move>().unwrap(), r#move);
        assert_eq!(
            &Move {
                quantum: Arc::new(QuantumMove {
                    family: "R".to_owned(),
                    prefix: None
                }),
                amount: 1
            },
            r#move
        );

        assert_eq!(
            &"2R".parse::<Move>().unwrap(),
            &Move {
                quantum: Arc::new(QuantumMove {
                    family: "R".to_owned(),
                    prefix: Some(MovePrefix::Layer(MoveLayer::new(2)))
                }),
                amount: 1
            },
        );

        assert_eq!(
            &"2-7R".parse::<Move>().unwrap(),
            &Move {
                quantum: Arc::new(QuantumMove {
                    family: "R".to_owned(),
                    prefix: Some(MovePrefix::Range(MoveRange::new(2, 7)))
                }),
                amount: 1
            },
        );
    }

    #[test]
    fn parse_alg() {
        let alg: &Alg = parse_alg!("R");
        assert_eq!(&"R".parse::<Alg>().unwrap(), alg);

        let alg: &Alg = parse_alg!("R U R'");
        assert_eq!(&"R U R'".parse::<Alg>().unwrap(), alg);
    }

    #[test]
    fn parse_move_trailing_underscores() {
        let r#move: &Move = parse_move!("R"_____); // TODO: Make this fail to compile.
        assert_eq!(&"R".parse::<Move>().unwrap(), r#move);
    }
}