Allow clean shutdown of applications

[SkyLined]

It should be possible for BugId to cleanly terminate an application by sending WM_CLOSE message to all windows associated with the processes it is debugging. A user should be able to trigger this by calling a method of BugId when a test is finished and the user wants to make sure the application can be closed without triggering any bugs during shutdown.

[SkyLined]

Set by step implementation plan: https://support.microsoft.com/en-us/kb/178893

1. Use EnumWindows to enumerate windows
   https://msdn.microsoft.com/en-us/library/windows/desktop/ms633497(v=vs.85).aspx
2. Use GetWindowThreadProcessID to get the process id for each window
   https://msdn.microsoft.com/en-us/library/windows/desktop/ms633522(v=vs.85).aspx
3. Ignore windows with a process id not in BugId's list of running processes.
4. Use PostMessage or SendMessageTimeout to send WM_CLOSE to remaining windows.
   https://msdn.microsoft.com/en-us/library/windows/desktop/ms644944(v=vs.85).aspx
   https://msdn.microsoft.com/en-us/library/windows/desktop/ms644952(v=vs.85).aspx
   https://msdn.microsoft.com/en-us/library/windows/desktop/ms632617(v=vs.85).aspx

[SkyLined]

It would make sense to implement most of the C code in Kill, so I've opened a bug at https://github.com/SkyLined/Kill/issues/1

[SkyLined]

Code will probably need to set a timeout using
https://github.com/SkyLined/BugId/blob/master/src/cCdbWrapper.py#L329
then after the timeout, enumerate processes in cdb.exe and do the stuff mentioned above.

[SkyLined]

Kill is no longer used by cBugId, but I could add the relevant APIs to mWindowsAPI and make direct calls. Since cCdbWrapper has a list of all running processes associated with the application at all times, I could close the application by sending a WM_CLOSE message to all Windows in all relevant processes without having to interrupt it in the debugger.