Keystone 1.3.2

A mod's world generation can be switched off. -Dkeystone.nogen=morevegetation,othermod makes Forge skip the world
generators whose class name contains one of those names (a mod id is usually part of its package), so the mod stops
scattering its plants, ores or rocks into newly generated chunks. Everything already placed keeps working, the blocks
stay craftable and placeable, and the log names each generator it skips. Empty by default, so the jar behaves exactly
as before unless the flag is set.