Implement wxSTCListBox using wxVListBox
Previously wxSTCListBox was a class derived from wxListView and required several extra steps to make the control look correct when it lacked focus. This commit changes wxSTCListBox so that it is a wxVListBox and is built to always draw itself looking as though it has focus. In addition this splits the work previously done by ListBoxImpl class among wxSTCListBox and a newly defined wxSTCListBoxVisualData class. wxSTCListBox manages the work done by a specific list and wxSTCListBoxVisualData manages the data common to all lists. All ListBoxImpl methods now simply forward to a method of one of those 2 classes.
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