Added Polygon.clp and updated the Loader with the load information
src/game/GameLoader.clp: Made another-world the sole module for the game

This will probably change over time, but I wouldn't count on that
src/game/types/Polygon.clp: Added the rest of the fields for the Polygon class
deleted src/lib/engine folder

It was not being used so it makes sense to just take it out.
Deleted src/lib/adventure

This folder is not necessary for this game implementation
Added the StringEntry type