fixed warnings

examples/hello_world/main.rs

@@ -9,7 +9,7 @@ fn init(gsa: &mut Gsa) -> Game {
     Game {}
 }
 
-fn update(game: &mut Game, gsa: &mut Gsa) {
+fn update(_game: &mut Game, gsa: &mut Gsa) {
     gsa.sprites[0].pos += gsa.input_dir();
 }
 

src/main.rs

@@ -1,7 +1,6 @@
 use clap::{crate_name, crate_version, Parser, Subcommand};
 use dunce::canonicalize;
 use path_slash::PathExt;
-use std::env::{current_dir, set_current_dir};
 use std::fs;
 use std::fs::{write, OpenOptions};
 use std::io::Write;

src/run.rs

@@ -2,8 +2,7 @@ use crate::buttons::{button_from_gilrs, button_from_scancode};
 use crate::gsa_render_to_screen::{render_to_screen, render_to_window};
 use crate::tileset::load_tileset;
 use crate::{
-    Buttons, Gsa, Sprite, FONT_BOLD, MAX_BACKGROUNDS, MAX_SPRITES, SCREEN_HEIGHT, SCREEN_WIDTH,
-    TRANSPARENT,
+    Buttons, Gsa, Sprite, FONT_BOLD, MAX_SPRITES, SCREEN_HEIGHT, SCREEN_WIDTH, TRANSPARENT,
 };
 use clap::crate_version;
 use gilrs::EventType;