CORE-18958
Introduce an emergency log-off and restart feature, available when holding
down the control key and selecting "Log Off" or "Shut down" in the MSGINA
Ctrl-Alt-Del security dialog, similar to Windows Server 2003 and newer
Windows versions.
- Convert all modeless dialog boxes back to modal dialog boxes.
- Use WM_TIMER to detect SHIFT key press instead, as you can't
directly intercept messages on modal dialog boxes.
- Remove some unused functions.
Fixes explorer crash on shutdown cancel. CORE-17749
Implement the re-worked shut down dialog box as well as implementing fancy log off dialog box.
- Fancy shut down dialog box has been redesigned to be more comparable to of XP.
- Implement features that were missing earlier.
- Implement the fancy log off dialog which is more comparable to of XP.
