commitmonitor Code

Delete the popup window in the WM_NCDESTROY handler, not the WM_DESTROY handler since that leads to crashes.

* add an empty line after the license header
* remove unneeded empty lines at the end of files
* use the right case for the includes
* always use <> for system headers
* update ext/Versions.txt

Handle the WM_DESTROY message and clean up there.
Update issue #369

convert tabs to spaces.

code cleanup:
* rename CRegStdWORD to CRegStdDWORD
* replace the stdstring defing with a typedef for tstring
* get rid of the wide_string typedef, use std::wstring instead

Make sure that even with IPv6 enabled the CommitMonitor can run on systems earlier than XP.

Indicate the GPL license.

Make the hand the default mouse cursor for the notification popup window.

Show the main dialog if the user clicks on the notification popup window.

Allow disabling the notification sound completely.