Fix compiling, use enum class

src/config.hpp

@@ -1,3 +1,7 @@
+#include <Arduino.h>
+
+#pragma once
+
 /**
  * Set to true to enable debug prints (via serial console) and false to disable.
  */

src/game.cpp

@@ -11,7 +11,7 @@ Game::Game(Debugger* debugger, Randomiser* randomiser)
       state(State::MENU),
       currentDelay(DELAY_START),
       currentScore(0),
-      waitingBeeps({}),
+      waitingBeeps{},
       waitingBeepsAmount(0) {
   debugger->print("Initialising new game...");
 }

src/game.hpp

@@ -2,7 +2,7 @@
 #include "debugger.hpp"
 #include "randomiser.hpp"
 
-enum State { MENU, GAME, SCORE };
+enum class State { MENU, GAME, SCORE };
 
 class Game {
   Debugger* debugger;