Short hand version for 'order(By)Descending' methods of a sequence.

// 3, 2, 1
Enumerable.sortDesc([2, 1, 3]);

// 11, 22, 33
Enumerable.sortDesc([22, 11, 33],
                    (x, y) => y - x);

With selector

// 3.3, 11, 22
Enumerable.sortDesc([11, 22, 3.3],
                    (x, y) => y - x,
                    x => x * 10);