Fix Fuel's field visibility, add it to the cutter

*Now* the fuel change events will work (and compile).

src/game/mod.rs

@@ -33,7 +33,7 @@ pub mod consumables {
   use bevy::prelude::*;
 
   #[derive(Component)]
-  pub struct Fuel(u32);
+  pub struct Fuel(pub u32);
 
   #[derive(Event)]
   pub struct FuelChanged;