QtNetwork based downloader. Features: 1. Download URLs in parallel. 2. Complete download progress information. Including size get, size total, speed, elapsed time, remaining time. 3. Specify download path. 4. Save what gets while downloading. Usage: ./qget [-P save_dir] url1 [url2 ... urlN] TODO: 1. Add GUI and better CUI 2. Resume broken transfer 3. Muti-thread in on downloading