Cleanup and fix accidental bevy imports

src/system/walker.rs

@@ -1,5 +1,4 @@
 use std::hash::Hash;
-use bevy::render::render_resource::encase::private::RuntimeSizedArray;
 use itertools::Itertools;
 use rand::distributions::Slice;
 use rand::prelude::Rng;

src/tools/boxcount.rs

@@ -1,6 +1,5 @@
 use std::fs::File;
 use std::os::unix::fs::symlink;
-use bevy::tasks::ParallelSlice;
 use crate::system::spaces::square_grid::{Grid2D, Grid3D};
 use itertools::{Itertools, MinMaxResult};
 use clap::Parser;