Start hex grid and make tests pass

src/main.rs

@@ -1,19 +1,10 @@
 #![feature(array_zip)]
 
 use std::path::PathBuf;
-use rand::prelude::*;
 
 mod system;
 mod example_systems;
 
-use system::walker::{LocalRandomWalker, Walker};
-use system::grid::VectorStorage;
-use num_integer::Integer;
-use rand::rngs::SmallRng;
-use crate::system::grid::Position;
-use crate::system::model::DLASystem;
-use crate::system::Storage;
-
 use clap::Parser;
 use crate::example_systems::stick_probability;