Replace tiles with re-drawn 32x32 graphics by Blues. Update Platform
creation loops in SecondMap to use MapTiles' Textures instead of
original spritesheet; update Platform's X and Y texture coord constants
to match. (Reconfigure this as a plain and simple Sprite object later?)
Update WatchNadia class to use new sprite. Make Refractor Platform
one row larger. Adjust positions in ThirdMap slightly.