Add a new minigame: biggest product

The goal of this new minigame is, as you expect, to find the biggest product between four products. All of the products are formed with 2 numbers between 1 and 10 in order to make it mental math challenge.

I also change the icon used to represent the lives, I make this new icon using the costumes editor in scratch (which is basically a svg editor), I used this editor because I am used to using scratch so it was the fastest for me.