first support for gamepad controls

src/main.rs

@@ -3,6 +3,7 @@ mod alien;
 mod billboards;
 mod camera;
 mod cash;
+mod controls;
 mod cutscene;
 mod gates;
 mod heads_ui;
@@ -88,6 +89,7 @@ fn main() {
     app.add_plugins(keys::plugin);
     app.add_plugins(squish_animation::plugin);
     app.add_plugins(cutscene::plugin);
+    app.add_plugins(controls::plugin);
 
     app.insert_resource(AmbientLight {
         color: Color::WHITE,