Complete overhaul of the lake generator, much more efficient now.
Sandstone biome added, look for it in low humidity areas. Heaven biome
implementation started, uncomment the code to preview.
With credit to paramat, now the noise values are even better tweaked,
and the islands are no longer cut off at chunk boundaries. Not to
mention insane landscapes.
Massive changes to island structure noise parameters, including taller
hills, larger caves, and rougher terrain, which also leads to more
lakes. Also added Cavorite and Silicon ores.
