A bunch of small changes

added the variables Item weapon and Item armor to the Character class
sort of completed the equipItem and useItem functions in the Character
class
completed the getters and setters for strength, agility, magic, level,
and health in the Character class
updated both the PlayerCharacter and AresCharacter class with the new
variables
removed the upgrade functions for the Item class
added the getType, getUpgradeCount functions to the Item class
changed the names of strength, agility, and magic int the Item class
changed the strength, agility, and magic variables into ints in the Item
class for the sake of consistency