Available through Installer.get_voiceover_archive_type and Installer.get_voiceover_archive_language
Also some other optimizations including not extracting unneeded files from diff archive, deprecate _read_version_from_config function, and added install_game, uninstall_game, voiceover_lang_translate, get_installed_voiceovers
Also add function to get the diff archive (for faster updating)
Download function soon, although I can't make sure that the download function will work properly (like pause, resume download etc.)