Explore 1.2

I have added a block class and a block manager. The block manager by default adds three blocks across the screen. When the PC collides with a block, the block turns red. There is a new collision system that is borrowed from Falling Balls (still all written by me), but much more optimized and efficient. As always, you can download all the source code via Dropbox here:
https://www.dropbox.com/sh/s5nwsqs2f5vsr7f/yKZIYzLUu0

Three Blocks, managed as a group by the Block Manager module

Demonstrating collision with a Block