libtorrent-2.0.5

• on windows, explicitly flush memory mapped files periodically
• fix build with WolfSSL
• fix issue where incoming uTP connections were not accepted over SOCKS5
• fix several issues in handling of checking files of v2 torrents, esp. from magnet links
• make the token limit when parsing metadata from magnet files configurable
• fix issue with stalled pieces on disk full errors
• fix missing python binding for file_progress_flags
• fix torrent_file_with_hashes() to fail when we don't have the piece layers
• restore path character encoding conversion for non UTF-8 locales on linux
• fix use-after-free bug in make_magnet_uri
• add write_torrent_file() to produce a .torrent file from add_torrent_params
• allow loading v2 .torrent files without piece layer
• fix issue with adding v2 torrents with invalid file root hash