Rewrite generation algorithms

[ur-fault]

For more options during the generation of the mazes, we need complete rewrite.

Right now, we generate each "block" individually, meaning floors in the tower are separated mazes and then combined into a list of floors.

This method is not bad, but not general enough. I'd like it to be general enough to be used anywhere, so that we can have blocks of blocks of mazes and something like island maze.