unify explosion handling

src/main.rs

@@ -47,7 +47,7 @@ use loading_assets::AudioAssets;
 use std::io::{Read, Write};
 use utils::{billboards, sprite_3d_animation, squish_animation, trail};
 
-use crate::utils::auto_rotate;
+use crate::utils::{auto_rotate, explosions};
 
 #[derive(Resource, Reflect, Debug)]
 #[reflect(Resource)]
@@ -173,6 +173,7 @@ fn main() {
     app.add_plugins(auto_rotate::plugin);
     app.add_plugins(heal_effect::plugin);
     app.add_plugins(tb_entities::plugin);
+    app.add_plugins(explosions::plugin);
 
     app.init_state::<GameState>();