add world.save_chunk_data(...)

src/voxels/compressed_chunks.hpp

@@ -5,8 +5,10 @@
 #include <vector>
 
 class Chunk;
+class WorldRegions;
 
 namespace compressed_chunks {
     std::vector<ubyte> encode(const Chunk& chunk);
     void decode(Chunk& chunk, const ubyte* src, size_t size);
+    void save(int x, int z, std::vector<ubyte> bytes, WorldRegions& regions);
 }