2.7 New: URI generator (from URI tool)

Fixed: thread deadlock unable to download files when HTTP server response conflicted headers: Accept-Ranges, Content-Range, Content-Encoding unable to download files when HTTP server response transfer_encoding is chunked with 0-byte data magnet-task causing filec crashes during multiple times of adding and canceling. ESC key on dialog duplicate shortcut key fileu dialog crashes fileu status bar DHT number was inaccurate. remote client crashes on windows 7 torrent-task directory icon missed after restarting filec