Superflat Caves

1.1.0

• Add support for Cave Generator, Worley's Caves and anything else that uses the Forge map event to provide a cave generator.
• Added support for ravines in a similar fashion.
• Modified all generators to call the Forge events by default when looking for a provider.
• Modified population to also trigger the water and lava lake events.
• Modified population to trigger the animals (if tagged) and ice events.
• New flags for generation: "caves" to enable caves, "ravines" to enable ravines, and "animals" to enable animals/spawn generation. (Not entirely sure how/if this will work).