Implement an enemy class

[aPruner]

• Implement abstract enemy class from which to inherit for future enemy types

[lwsm1th]

Per discussion:

• Inherits from GameObject, similar to Player class
• Should have attributes such as: health, levels, stats, loot drops, etc.
• Consider including pathfinding or leave for down the road (random movement may also be suitable)
• TBD - not everything is fleshed out