introduce compressed_chunks namespace

src/voxels/compressed_chunks.hpp

@@ -0,0 +1,12 @@
+#pragma once
+
+#include "typedefs.hpp"
+
+#include <vector>
+
+class Chunk;
+
+namespace compressed_chunks {
+    std::vector<ubyte> encode(const Chunk& chunk);
+    void decode(Chunk& chunk, const ubyte* src, size_t size);
+}