Branch/new terrain

Add new terrain and mountains

@kadst43, @BrettASwift, and @scottnc27603, here is the new terrain.  I think it proves that we really need texture blending to work.

I also discussed w/ Ken that we will need rocks, debris, crags, or some other way of delimiting the right side of the maze.

I'm not sure if we want to merge this back to master or wait until we have texture blending working.