Grid: remove unneeded power of two restriction

src/grid.rs

@@ -60,9 +60,6 @@ impl Grid {
         rng: &mut R,
         agents: Vec<Agent>,
     ) -> Self {
-        if !width.is_power_of_two() || !height.is_power_of_two() {
-            panic!("Grid dimensions must be a power of two.");
-        }
         let range = Uniform::from(0.0..1.0);
         let data = rng.sample_iter(range).take(width * height).collect();