A simple implementation of the astar pathfinding algorithm from red blob games.

In order to use the pathfinder you must have a path map for it to navigate. You can define one by implementing the PathingMap trait, or you can use the built-in PathMap2d.

Example

```rust use sark_pathfinding::*;

let map = PathMap2d::new([50,50]); let mut astar = AStar::from_size([50,50]);

let path = astar.find_path(&map, [4,4], [10,10]).unwrap(); ```

From the "terminal" example.