Cleaned up some of the code in PocketGenerator. Seeded the generation of
Monoliths as a function of the world seed. All of our randomized
selections should be functions of the world seed so people can exchange
seeds with cool DD features. I will rename the file to have proper
capitalization in the next commit. Then I have to fix Monolith spawning.
Also, don't use recursion as a way to loop functions if you could simply
have a loop. I'm referring to the way PocketGenerator.populate() calls
itself. Completely unnecessary.
