* 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
FDI allows to have user-defined callbacks for file handling.
Since it doesn't provide support for Unicode we convert strings to
multi-byte UTF-8 and handle them appropriately in the callbacks. They
are properly null-terminated so FDI won't choke when doing operations
with strings.
Thanks to hbelusca and mjansen for the help.
CORE-14466
