Simple Grid

I noticed I kept reimplementing the same 2d-grid structure in many of my personal projects, so I decided to make it into a library. This data structure does not attempt to be the fastest or best implementation of a 2d-grid, but it's simple to use and has zero dependencies.

Example usage

``` use simple_grid::Grid;

let grid = Grid::new(10, 10, (1..=100).collect::>()); assert_eq!(grid.get((5, 2)).unwrap(), &26);

println!("{}", grid); // prints: // 1 2 3 4 5 6 7 8 9 10 // 11 12 13 14 15 16 17 18 19 20 // 21 22 23 24 25 26 27 28 29 30 // 31 32 33 34 35 36 37 38 39 40 // 41 42 43 44 45 46 47 48 49 50 // 51 52 53 54 55 56 57 58 59 60 // 61 62 63 64 65 66 67 68 69 70 // 71 72 73 74 75 76 77 78 79 80 // 81 82 83 84 85 86 87 88 89 90 // 91 92 93 94 95 96 97 98 99 100 ```