Implement incremental search in wxGenericListCtrl.

Mostly copy wxGenericTreeCtrl incremental search implementation to
wxGenericListCtrl (unfortunately there is no simple way to reuse this code
currently), including the recently added EnableBellOnNoMatch() method.

Update the sample to test it, the key event handling in it had to be modified
to allow it.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72639 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/listctrl.h

@@ -407,6 +407,18 @@ public:
     wxTextCtrl* EditLabel(long item,
                           wxClassInfo* textControlClass = wxCLASSINFO(wxTextCtrl));
 
+    /**
+        Enable or disable a beep if there is no match for the currently
+        entered text when searching for the item from keyboard.
+
+        The default is to not beep in this case except in wxMSW where the
+        beep is always generated by the native control and cannot be disabled,
+        i.e. calls to this function do nothing there.
+
+        @since 2.9.5
+    */
+    void EnableBellOnNoMatch(bool on);
+
     /**
         Finish editing the label.