This library contains various "dice rolling" functions and traits.
Dice rolling is currently implemented only for `i32`.
```
// Some normie dice:
let a = 3.d6(); // 3d6
let b = 10.d10(); // 10d10
// Delta variancy:
let d = 1.0.delta(5);
// 50% chance of `c` becoming 5 (otherwise 0).
let c = chance_of!(5, 50);
```