Modifies cliff and shore generation to create natural defensive chokepoints throughout the map.

Note that there are some 15 or so "terrain programs" you can choose from; simply edit the first line in control.lua to any one of the filenames in /programs.

Also, terrain gen continues in the background for a while after first creating a map, so you will see small amounts of microstutter with this installed for the first 40 minutes or so of each save.