Starve: If a doodlebug has not eaten an ant within three time steps, at the end of the third time step it will starve and die. The doodlebug should then be removed from the grid of cells.
Need to either add a function to delete to doodle bug from the board and space. We could keep the Critter but not have it refer to the Space (and vice versa).
Starve: If a doodlebug has not eaten an ant within three time steps, at the end of the third time step it will starve and die. The doodlebug should then be removed from the grid of cells.