Configured damage structure so that it has three parameters now - damageAmount, damageType, damageCritChance.
Modified item data structure, so that every item is able to contain list of effects. Implemented Effects and EffectDatas hierarchy.
Implemented fight controller and item's attack and takeEffects functions to work with effects. Made reduceHealth function in fightController,
which deals damage considering crit chance (TBA: damage reduction depending on armor).