Revert "minedmap: store region list in BTreeSet"

This reverts commit b53d34da3d.

With the change of the mipmapper data structure, we need a conversion
step anyways, so we can keep using the Vec before mipmapping.

src/bin/minedmap/main.rs

@@ -26,8 +26,8 @@ fn main() -> Result<()> {
 	let config = Config::new(args);
 
 	let regions = RegionProcessor::new(&config).run()?;
-	TileRenderer::new(&config).run(regions.iter().copied())?;
-	TileMipmapper::new(&config).run(regions)?;
+	TileRenderer::new(&config).run(&regions)?;
+	TileMipmapper::new(&config).run(&regions)?;
 
 	Ok(())
 }