Move preferences to an action instead of a wx event

common/eda_base_frame.cpp

@@ -101,7 +101,6 @@ static const wxSize defaultSize( FRAME_T aFrameType )
 
 BEGIN_EVENT_TABLE( EDA_BASE_FRAME, wxFrame )
     EVT_MENU( wxID_ABOUT, EDA_BASE_FRAME::OnKicadAbout )
-    EVT_MENU( wxID_PREFERENCES, EDA_BASE_FRAME::OnPreferences )
 
     EVT_CHAR_HOOK( EDA_BASE_FRAME::OnCharHook )
     EVT_MENU_OPEN( EDA_BASE_FRAME::OnMenuEvent )
@@ -1049,12 +1048,6 @@ void EDA_BASE_FRAME::OnKicadAbout( wxCommandEvent& event )
 }
 
 
-void EDA_BASE_FRAME::OnPreferences( wxCommandEvent& event )
-{
-    ShowPreferences( wxEmptyString, wxEmptyString );
-}
-
-
 void EDA_BASE_FRAME::ShowPreferences( wxString aStartPage, wxString aStartParentPage )
 {
     wxBeginBusyCursor( wxHOURGLASS_CURSOR );