Implements the following:
--New art (not fully done yet)
--Added Aura tech. An Aura is an event listener for certain events such as onDeath() or onDamageTaken(). Auras are currently only supported for the player by armour piece. This is subject to change or iteration.
--Fixed Heaven's Reprieve, adding it back as an Aura.
--Improved the flat damage reduction from defense by 25%, from 0.3 to 0.375 Points of damage per defense.
--Updated some StatusEffect copy constructors
Fix