Remove debug prints, correct reverse gear, tidy loop

- Comment out all Serial debugging statements and the artificial delay
  in
  Engine::update.
- Change reverse gear detection from `gearIdx == 5` to `gearIdx == -1`.
- Simplify the main loop in Projekt.ino by removing unnecessary braces,
  eliminating temporary blink variables, and calling
  `display.updateDirection`
  directly with the pin reads.

Engine.cpp

@@ -14,74 +14,74 @@ float Engine::readNormalized(uint8_t pin) const {
 }
 
 void Engine::update(float dt, uint8_t gearIdx) {
-  Serial.println("----------------");
+  // Serial.println("----------------");
 
   const float throttle = readNormalized(_throttlePin);
-  Serial.print("Throttle: ");
-  Serial.println(throttle);
+  // Serial.print("Throttle: ");
+  // Serial.println(throttle);
 
   const float clutch = readNormalized(_clutchPin);
-  Serial.print("Clutch: ");
-  Serial.println(clutch);
+  // Serial.print("Clutch: ");
+  // Serial.println(clutch);
 
   const float brake = readNormalized(_brakePin);
-  Serial.print("Brake: ");
-  Serial.println(brake);
+  // Serial.print("Brake: ");
+  // Serial.println(brake);
 
   const float targetRPM = RPM_IDLE + throttle * (RPM_MAX - RPM_IDLE);
-  Serial.print("targetRPM: ");
-  Serial.println(targetRPM);
+  // Serial.print("targetRPM: ");
+  // Serial.println(targetRPM);
 
   const float wheelRPM = (_speedMs / (2.0f * PI * WHEEL_RADIUS)) * 60.0f;
-  Serial.print("wheelRPM: ");
-  Serial.println(wheelRPM);
+  // Serial.print("wheelRPM: ");
+  // Serial.println(wheelRPM);
 
   const float gearRatio = GEAR_RATIO[gearIdx];
-  Serial.print("gearRatio: ");
-  Serial.println(gearRatio);
+  // Serial.print("gearRatio: ");
+  // Serial.println(gearRatio);
 
   const float drivenRPM = wheelRPM * fabs(gearRatio) * FINAL_DRIVE;
-  Serial.print("drivenRPM: ");
-  Serial.println(drivenRPM);
+  // Serial.print("drivenRPM: ");
+  // Serial.println(drivenRPM);
 
   _engineRPM = clutch * drivenRPM + (1.0f - clutch) * targetRPM;
-  Serial.print("_engineRPM: ");
-  Serial.println(_engineRPM);
+  // Serial.print("_engineRPM: ");
+  // Serial.println(_engineRPM);
 
   _engineRPM = constrain(_engineRPM, RPM_IDLE, 7500.0f);
-  Serial.print("_engineRPM (constrain): ");
-  Serial.println(_engineRPM);
+  // Serial.print("_engineRPM (constrain): ");
+  // Serial.println(_engineRPM);
 
   const float engineForce = (_engineRPM / RPM_MAX) * (1.0f - clutch) * ENGINE_FORCE_FACTOR;
-  Serial.print("engineForce: ");
-  Serial.println(engineForce);
+  // Serial.print("engineForce: ");
+  // Serial.println(engineForce);
 
   const float brakeForce = brake * BRAKE_FORCE_MAX;
-  Serial.print("brakeForce: ");
-  Serial.println(brakeForce);
+  // Serial.print("brakeForce: ");
+  // Serial.println(brakeForce);
 
   const float dragForce = 0.5f * DRAG_COEFF * FRONTAL_AREA * (_speedMs * _speedMs);
-  Serial.print("dragForce: ");
-  Serial.println(dragForce);
+  // Serial.print("dragForce: ");
+  // Serial.println(dragForce);
 
-  const int direction = (gearIdx == 5) ? -1 : 1;
-  Serial.print("direction: ");
-  Serial.println(direction);
+  const int direction = (gearIdx == -1) ? -1 : 1;
+  // Serial.print("direction: ");
+  // Serial.println(direction);
 
   const float netForce = direction * engineForce - brakeForce - dragForce;
-  Serial.print("netForce: ");
-  Serial.println(netForce);
+  // Serial.print("netForce: ");
+  // Serial.println(netForce);
 
   const float acceleration = netForce / CAR_MASS;
-  Serial.print("acceleration: ");
-  Serial.println(acceleration);
+  // Serial.print("acceleration: ");
+  // Serial.println(acceleration);
 
   _speedMs += acceleration * dt;
   if (_speedMs < 0.0f) _speedMs = 0.0f;
-  Serial.print("_speedMs: ");
-  Serial.println(_speedMs);
+  // Serial.print("_speedMs: ");
+  // Serial.println(_speedMs);
 
-  delay(1000);
+  // delay(1000);
 }
 
 int Engine::getRPM() const {