shad/ML1: hw2 in process
shad/ML1: add smooth balancing
shad/cxx2: add fish starvation dying.

Add class DiedFishStrategy
Changes in FishStrategy: set strategy to DiedFish if starvation is 0.
shad/cxx2: add PredatorStrategy, add died eye to
fishes who are died. Correct direction of died fishes
shad/cxx2: predators always turns first.
It mean, what if food is near to predator, then predator must
eat them.