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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.