add using namespace godot; everywhere to includes

Author: Ughuuu

binding_generator.py

@@ -1593,6 +1593,7 @@ def generate_compat_includes(godot_repo: Path, output_dir: Path):
         result.append(f"#else")
         file_godot_cpp_name = file_godot_cpp_name.replace("gen/include/", "")
         result.append(f"#include <{Path(file_godot_cpp_name).as_posix()}>")
+        result.append(f"using namespace godot;")
         result.append(f"#endif")
         result.append("")
         result.append(f"#endif // ! {header_guard}")