-made Player a static class within Game.java
-made Locations objects that have four potential Location references, for north, south, east, and west, which act as the neighbors, and changed all relevant methods within to conform to the new way
-made World.java no longer grid-based, simply has a list of all Locations, and initializes the world
-changed move() within Game.java to work with linked Locations rather than a grid-based world