commitmonitor Code

* 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

convert tabs to spaces.

Prevent selecting an entry when doubleclicking on the error text shown over the list control.
This fixes issue #68.

Allow the hint text to *not* be cleared by a doubleclick.

Add new class CListCtrl which subclasses a list view control.
The class provides additional features (to be extended in the future), but for now it provides the ability to show a "hint" text instead of the list control contents. Useful for messages like "please wait while we do something that can take a while" or showing an error message or...

This is the first step to implement issue #3.