Moore neighborhoods (8-connected)

A little library for generating [Moore neighborhoods] (i.e., the surrounding cells of a single cell in a grid) of arbitrary range and dimensions. Or, the red edge squares for a blue center square:

The code was ported from [hughsk/moore] and adjusted for Rust features such as const generics.

Usage example

```rust use moore_neighboorhood::dynamic::moore;

fn example() { let mut result: Vec> = moore(1, 2);

let mut expected = [
    [-1,-1], [ 0,-1], [ 1,-1],
    [-1, 0],          [ 1, 0],
    [-1, 1], [ 0, 1], [ 1, 1]
];

result.sort();
expected.sort();
assert_eq!(result, expected);

} ```

Using const generics for the dimension:

```rust use mooreneighboorhood::genericdimension::moore;

fn example() { let mut result: Vec<[isize; 2]> = moore(1);

let mut expected = [
    [-1,-1], [ 0,-1], [ 1,-1],
    [-1, 0],          [ 1, 0],
    [-1, 1], [ 0, 1], [ 1, 1]
];

result.sort();
expected.sort();
assert_eq!(result, expected);

} ```