GUI Bugfix: fis the problem that the option "Do not prompt when add new task" doesn't work
GUI Bugfix: fix the bug that the program may crash when display some non-standard rss item
Core Improved: improve selected file download algorithm, decrease the possibility to re-download file boundary data
Core Bugfix: fix the bug that the program may crash when parsing some non-standard HTTP protocol packet
Core Bugfix: fix the bug that the program may crash when parsing some non-standard encryption protocol packet