Implemented this class to contain the lists of entities available.
Added methods to collide bots together, as well as draw/update food
specks and handle collisions with bots.
Changed size to a float for collisions - drawing methods need to scale.
Added an age variable, known as mFramesAlive.
Changed draw method to use scaling, as size is less than 1.
Implemented class from nothing.
Added two new events, Bot created and Food Speck destroyed.
Completed a line! :)