Sækja BitComet 1.80

- GUI Improve: new setting in Advanced Options: network.dns_query_thread_count and network.dns_query_cache_ttl
- GUI Improve: new setting in Advanced Options: bittorrent.peer_dual_ip whether connect to the peer's IPv4/IPv6 address reported by itself
- GUI Improve: change the default value of advanced options bittorrent.utp_after_holepunch to auto, initiate uTP directly after try UDP hole punching
- GUI Improve: add Connect Pending state for HTTP/UDP/WSS trackers
- GUI Improve: display connecting timeout info of UDP trackers
- GUI Improve: display the number of received peers from PEX in peer list
- GUI Bugfix: the protocol info in peer list is inaccurate sometimes
- GUI Bugfix: mistake in help info of NAT type detect dialog
- Core Improve: query DNS using multiple threads
- Core Improve: support binding IP address for UDP transfer
- Core Improve: filter invalid peer IP returned from Tracker
- Core Improve: fix reconnect issue of second request packet to UDP tracker
- Core Improve: support implied_port parameter in DHT protocol to help improve uTP transport via NAT
- Core Improve: use UDP source port instead of listening port for uTP peers when sending peer list through PEX
- Core Improve: optimize the number of uTP packet resend to improve UDP hole punching
- Core Improve: CPU usage of UDP transfer in graph pane includes DHT and uTP threads
- Core Bugfix: improve timeout handle of hole punching
- Core Bugfix: improve stability of uTP transfer
- Core Bugfix: timeout process missing for stop event of WSS tracker
- Core Bugfix: incoming uTP connections should be excluded for TCP listening port forwards status detection