update region file format 2 to 3 (WIP)

src/files/files.hpp

@@ -7,6 +7,7 @@
 #include <vector>
 
 #include "typedefs.hpp"
+#include "util/Buffer.hpp"
 
 namespace fs = std::filesystem;
 
@@ -59,6 +60,7 @@ namespace files {
     );
 
     bool read(const fs::path&, char* data, size_t size);
+    util::Buffer<ubyte> read_bytes_buffer(const fs::path&);
     std::unique_ptr<ubyte[]> read_bytes(const fs::path&, size_t& length);
     std::vector<ubyte> read_bytes(const fs::path&);
     std::string read_string(const fs::path& filename);