Changing Eren Jeaeger level unlocked to 0 (player.xml)
Changing Game.java initial screen to MainMenuGUI (Game.java)
-GameMenuGUI : udah jadi (level 1), tinggal dibikin Scene Pop Up kalo udah sampe finish
 (sekarang sampe finish charnya nyangkut,trus pencet enter buat balik ke level menu
 scene)
-LevelMenuGUI : Fix bug saat level unlocked = 1, level 2 nya jadi ke unlocked
                (tadinya level 2 nya tetep ke lock)