BitComet 0.75

- GUI Improved: add HTTP/FTP download in file menu
- GUI Improved: add HTTP/FTP download settings page in preferences dialog
- GUI Improved: add "Download using BitComet" command in IE context menu as a option
- GUI Improved: switch to downloading task list automatically if downloaded task list is being showed when add new task
- GUI Improved: the translator's name is able to be set in language file edit dialog
- GUI Improved: add clear button in torrent info search page of task properties dialog
- GUI Improved: the TCP half open limit is up to 500 in preferences dialog
- GUI Bug fix: fix the bug in 0.74 that non-executable file can not be opened in file list
- GUI Bug fix: fix the bug of a display mistake of the balloon tooltip when task download finish
- Core Improved: add HTTP/FTP multi-connection download function
- Core Improved: add HTTP/FTP multi-connection download disk cache function
- Core Bug fix: fix the bug in 0.74 that in rare situation program will crash due to file operation