9/1

Created EnemyController to handle Enemy stats logic
Removed responsibility of loading Enemies from BattleViewController
    Moved to EnemyController
Added dealloc methods to PlayerController and EnemyController
Prevented the Start Battle Button (in HomeFooterView) from working if a battle is on-going
Created time limit countdown logic in EnemyController
Added lose condition: timer runs out in BattleViewController
Added win condition: enemy health runs out in BattleViewController