pythonic style improvements
pep8
removed globals in new_turn function
more pythonic print board function using enumerate in loops
more pythonic human_draw_card function using enumerate in loops
more pythonic human_pick_slot function using enumerate in loops
more pythonic ai_pick_or_draw with for x in list, and less indices
created a forced_move checker function to avoid repeating myself
now with Player class, 3 to 5 players, turn order feature, and more pythonic.