Bukkit introduced a new world generator API. This is great news, as most world generator plugins will no longer need to use NMS or this API. This is just a quick update to make sure that this API still works with the latest Spigot builds. In the future, this API will need a redesign so that all overlapping functionality is removed from this API.

• Updated to be compatible with latest Spigot builds, with the new world generator.
• Fix missed function update in ChunkData.setBlock. (By @SuperSpyTX )
• If changing the NoiseGeneratorSettings fails, a more descriptive error message is now printed.