ChunkDataEvent is fired when an event involving chunk data occurs.
If a method utilizes this Event as its parameter, the method will
receive every child event of this class.
ChunkDataEvent.data contains the NBTTagCompound containing the chunk data for this event.
ChunkDataEvent.Save is fired when vanilla Minecraft attempts to save Chunk data.
This event is fired during chunk saving in
ChunkMap#save(ChunkAccess).
ChunkEvent.Load is fired when vanilla Minecraft attempts to load a Chunk into the level.
This event is fired during chunk loading in
Chunk.onChunkLoad().
ChunkEvent.Unload is fired when vanilla Minecraft attempts to unload a Chunk from the level.
This event is fired during chunk unloading in
Chunk.onChunkUnload().