Create Player sprite class

[DainialPadraig]

Create class for human with associated attributes. Sprite can be cloned to be either the player or a shopkeeper. (Both are humans in Hack.)

[DainialPadraig]

Changed this issue to creating only the player sprite. There are other human sprites: the shopkeep (maybe? There is disagreement about whether or not Jay's initial version of Hack included shops in the dungeon) and guards. Both the shopkeep and the guards are unique enough that they should have their own classes, as well.

The player should keep track of the following attributes:

• Gold
• Hit Points
• Armor Class
• Strength
• Experience
• Carrying Capacity
• Inventory