Added ItemHurtEvent, ItemDeathEvent (ItemEntity)

-Added ItemDeathEvent
-Added ItemHurtEvent
-Modified Forgehooks to conform EVENT_BUS.post(Event) conventions:
--added onItemHurt(ItemEntity, DamageSource, float)
--added onItemDeath(ItemEntity, DamageSource)
-Modified attackEntityFrom(DamageSource, float)  EnityItem to post
Events.