Refactor owner-drawing code.

Only keep common code in the base class and extract all menu/listbox-specific
stuff into derived classes.

This makes the code cleaner and more maintainable but introduces some problems
in wxCheckListBox appearance which will be fixed by the next patch.

Closes #10635.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63220 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/menu.cpp

@@ -578,7 +578,7 @@ bool wxMenu::DoInsertOrAppend(wxMenuItem *pItem, size_t pos)
 
                 // tell the item that it's not really owner-drawn but only
                 // needs to draw its bitmap, the rest is done by Windows
-                pItem->ResetOwnerDrawn();
+                pItem->SetOwnerDrawn(false);
             }
         }
 #endif // __DMC__