Reworked scoring on casual

Casual mode now scores only when you make a pumpkin.  each pumpkin is 1 point.  Giant pumpkin is 2 points.  There is no out of bounds...keep playing as long as you like.

Timed mode the goal is to get to a pumpkin as fast as possible, lowest time is best.  There is no out of bounds, game ends when you get your first pumpkin.

Challenge mode this is really the standard mode.  Any veggies that fall outside the bag will trigger game over.  Play for high score.  raddish is worth 5 points,  Each veggie in order is worth double the previous.  So garlic is worth 10 points and chili pepper is worth 20, etc...