Entity children need to call entity constructors

[jstamant]

Due to time constraints, I didn't figure out how to make the children of Entity call the non-default constructor of Entity.

ex: When I call Character character(0, 100), I want the character object to use Entity's Entity(int, int) constructor. Right now, it isn't, and I've taken the code from Entity(int, int) and placed it in all the other children. Inefficient, and prone to error.