Simplify working with controls (#27)

src/control/mod.rs

@@ -31,9 +31,9 @@ pub struct ControlState {
 }
 
 #[derive(Resource, Debug, Default)]
-pub struct Controls {
-    pub keyboard_state: ControlState,
-    pub gamepad_state: Option<ControlState>,
+struct Controls {
+    keyboard_state: ControlState,
+    gamepad_state: Option<ControlState>,
 }
 
 #[derive(Event)]
@@ -44,6 +44,7 @@ pub struct SelectedController(ControllerSet);
 
 pub fn plugin(app: &mut App) {
     app.init_resource::<SelectedController>();
+    app.init_resource::<ControlState>();
 
     app.add_plugins(controls::plugin);
     app.add_plugins(controller_common::plugin);