showLevelOverview method

void showLevelOverview ()

Shows the 'levelOverview' and activates the button click listener for listenStartLevelButton listenChooseLevelButton listenCreditsButton

Implementation 

void showLevelOverview() {
  MenuView.show().levelOverview(this._activeLevel, _getLevelInstruction(this._activeLevel)).render();
  this.listenStartLevelButton();
  this.listenChooseLevelButton();
  this.listenCreditsButton();
}