Wrote Method for computing pixels from model sizes in class Renderer.
Modified drawing methods for accepting relative size instead of a static
pixel size as radius (when drawing circles for each object). Modified
collision value.
Changed size and value parameters for Exit, Fence, Player, Robot,
Target.
Pimped method collides() in class Item.
Modified gameboard for Arena.
Removed checker-methods temporarily from method evolve() in class
RobotzControl