#19 BattleScreen GameScreen 연결, 승패도망 로그출력, 전투시 승패는 랜덤으로 결정
Merge remote-tracking branch 'origin/#21_Making_WorldMapScreen' into Developer

Conflicts:
	core/src/com/mygdx/screen/GameScreen.java
[Bug] OneLevelHero클래스를 MenuScreen으로 연결