21_pb_cu2 ChangeLevel method

private void ChangeLevel(State newState, AudioClip soundToPlay, string methodToInvoke, float invokeTime)
{
// newState - a new state of the rocket
// soundToPlay - sound which must be played while this method executed
// methodToInvoke - the name of a method which must be executed
// invokeTime - time of invoke
currentState = newState;
audioSource.Stop();
audioSource.PlayOneShot(soundToPlay);
Invoke(methodToInvoke, invokeTime);
}