world/de: new module for deserialization data structures

The new structures contain only the fields that MinedMap needs.

src/main.rs

@@ -1,3 +1,20 @@
-fn main() {
-	println!("Hello, world!");
+use std::path::PathBuf;
+
+use anyhow::Result;
+use clap::Parser;
+
+#[derive(Debug, Parser)]
+struct Args {
+	/// Filename to dump
+	file: PathBuf,
+}
+
+fn main() -> Result<()> {
+	let args = Args::parse();
+
+	minedmap::io::region::from_file(args.file.as_path())?.foreach_chunk(
+		|coords, value: minedmap::world::de::Chunk| {
+			println!("Chunk {:?}: {:#?}", coords, value);
+		},
+	)
 }