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

samples/listctrl/listtest.h

@@ -147,6 +147,7 @@ protected:
     void OnThaw(wxCommandEvent& event);
     void OnToggleLines(wxCommandEvent& event);
     void OnToggleHeader(wxCommandEvent& event);
+    void OnToggleBell(wxCommandEvent& event);
 #ifdef __WXOSX__
     void OnToggleMacUseGeneric(wxCommandEvent& event);
 #endif // __WXOSX__
@@ -219,6 +220,7 @@ enum
     LIST_SET_BG_COL,
     LIST_TOGGLE_MULTI_SEL,
     LIST_TOGGLE_HEADER,
+    LIST_TOGGLE_BELL,
     LIST_TOGGLE_FIRST,
     LIST_SHOW_COL_INFO,
     LIST_SHOW_SEL_INFO,