[FS] Cleanup, stub SDMC, start implementing SaveData

src/core/fs/archive_save_data.cpp

@@ -0,0 +1,17 @@
+#include "fs/archive_save_data.hpp"
+#include <memory>
+
+bool SaveDataArchive::openFile(const FSPath& path) {
+	Helpers::panic("SaveDataArchive::OpenFile");
+	return false;
+}
+
+ArchiveBase* SaveDataArchive::openArchive(const FSPath& path) {
+	Helpers::panic("SaveDataArchive::OpenArchive");
+	return nullptr;
+}
+
+std::optional<u32> SaveDataArchive::readFile(FileSession* file, u64 offset, u32 size, u32 dataPointer) {
+	Helpers::panic("SaveDataArchive::ReadFile");
+	return std::nullopt;
+}