New Inventory File

-Attempted to decouple Warrior class from the Weapon and Armor classes
by creating a separate inventory class
-Warrior class is still coupled to armor class from
Warrior::Attack(Warrior&,int) function
-Still indirectly coupled to both Weapon and Armor classes via an
Inventory object
-Probably a new fest of bugs that I will not be able to spot without the
weapon and armor classes finished.