continue transfer object refactor, re-enabling avatar receiving

src/backends/std_fs.hpp

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <solanaceae/object_store/object_store.hpp>
+
+namespace Backends {
+
+struct STDFS : public StorageBackendIMeta, public StorageBackendIFile2 {
+	ObjectStore2& _os;
+
+	STDFS(
+		ObjectStore2& os
+	);
+	~STDFS(void);
+
+	ObjectHandle newObject(ByteSpan id, bool throw_construct = true) override;
+
+	// TODO: interface?
+	bool attach(Object ov);
+
+	std::unique_ptr<File2I> file2(Object o, FILE2_FLAGS flags) override;
+};
+
+} // Backends
+