* [RAPPS] now command-line option supports begin with both / and -
* [RAPPS] Add help command with /?
* [RAPPS] add /find command
* [RAPPS] add /info option
* [RAPPS] add copyright and contact e-mail
* add one more layer of window
* using Path* API to operate path
* always use rappmgr.cab as file name when downloading db. ignore the URL
* add snapshot preview window
* show a broken-image icon when failed to load image
* add a padding between image and content, and make sure always some space is reserved for richedit
* hide the padding if snapshot window does not have a width
* some work to avoid blinking when window resizing
* add WM_PRINTCLIENT handling
- Add download source in settings dialog, and apply it when download .cab file
- Now user should specify full rappmgr.cab URL
- Check if URL is vaild in settings dialog
- Move source settings to the end of struct (will refactor settings to one value per option later)