1.2.1 release
- add dht_pkt_alert and alerts_dropped_alert to python bindings
- fix python bindins for block_uploaded_alert
- optimize resolving duplicate filenames in loading torrent files
- fix python binding of dht_settings
- tighten up various input validation checks
- fix create_torrent python binding
- update symlinks to conform to BEP 47
- fix python bindings for peer_info
- support creating symlinks, for torrents with symlinks in them
- fix error in seed_mode flag
- support magnet link parameters with number siffixes
- consistently use "lt" namespace in examples and documentation
- fix Mingw build to use native cryptoAPI
- uPnP/NAT-PMP errors no longer set the client's advertised listen port to zero