tabled 0.21.0

An easy to use library for pretty print tables of Rust `struct`s and `enum`s.
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#![cfg(feature = "std")]
#![cfg(feature = "assert")]

use tabled::{
    assert::test_table,
    grid::config::Entity,
    settings::{
        object::{Columns, Object, ObjectIterator, Segment},
        Alignment, Style,
    },
};

use crate::util::Matrix;

// todo: Columns::all()

test_table!(
    skip,
    Matrix::new(3, 3).with(Style::psql()).modify(Columns::new(..).not(Columns::first()).skip(2), Alignment::right()),
    " N | column 0 | column 1 | column 2 "
    "---+----------+----------+----------"
    " 0 |   0-0    |      0-1 |      0-2 "
    " 1 |      1-0 |      1-1 |      1-2 "
    " 2 |      2-0 |      2-1 |      2-2 "
);

test_table!(
    skip_segment_all,
    Matrix::new(3, 3).with(Style::psql()).modify(Segment::all().skip(1), Alignment::right()),
    " N | column 0 | column 1 | column 2 "
    "---+----------+----------+----------"
    " 0 |   0-0    |   0-1    |   0-2    "
    " 1 |   1-0    |   1-1    |   1-2    "
    " 2 |   2-0    |   2-1    |   2-2    "
);

test_table!(
    step_by,
    Matrix::new(3, 3).with(Style::psql()).modify(Columns::new(..).step_by(3), Alignment::right()),
    " N | column 0 | column 1 | column 2 "
    "---+----------+----------+----------"
    " 0 |   0-0    |   0-1    |      0-2 "
    " 1 |   1-0    |   1-1    |      1-2 "
    " 2 |   2-0    |   2-1    |      2-2 "
);

test_table!(
    filter,
    Matrix::new(3, 3).with(Style::psql()).modify(Columns::new(..).filter(|e| matches!(e, Entity::Column(1 | 3))), Alignment::right()),
    " N | column 0 | column 1 | column 2 "
    "---+----------+----------+----------"
    " 0 |      0-0 |   0-1    |      0-2 "
    " 1 |      1-0 |   1-1    |      1-2 "
    " 2 |      2-0 |   2-1    |      2-2 "
);