world: store BlockTypes in section types

Prepare for sections returning BlockType data directly instead of block IDs.

src/main.rs

@@ -75,7 +75,7 @@ impl<'a> RegionProcessor<'a> {
 
 	/// Processes a single chunk
 	fn process_chunk(&self, data: world::de::Chunk) -> Result<Box<world::layer::BlockInfoArray>> {
-		let chunk = world::chunk::Chunk::new(&data)?;
+		let chunk = world::chunk::Chunk::new(&data, &self.block_types)?;
 		world::layer::top_layer(&chunk, &self.block_types)
 	}