Correct exports; add some file serialization; fix service base object serialization

src/core/file_sys/archive_extsavedata.h

@@ -103,6 +103,9 @@ std::string GetExtDataContainerPath(const std::string& mount_point, bool shared)
  */
 Path ConstructExtDataBinaryPath(u32 media_type, u32 high, u32 low);
 
+class ExtSaveDataDelayGenerator;
+
 } // namespace FileSys
 
 BOOST_CLASS_EXPORT_KEY(FileSys::ArchiveFactory_ExtSaveData)
+BOOST_CLASS_EXPORT_KEY(FileSys::ExtSaveDataDelayGenerator)