Basic changes

I added some more width and a little turbulence to caves, making them more interesting. Also removed the spawn watching class which was causing normal passive mobs to stop spawning pretty much altogether, it wasn't needed. Changed the mushroom frequency so that red mushrooms will be rarer than brown, as per standard Minecraft. Slightly increased the spawn rate of emerald, after using WorldEdit to sift through a few hills biomes and counting the findings it felt a little low, though there are probably programs that can be used to better feel that out. Removed a call to an unused library. Added the chance for lava falls.