Issue 4550: Avoid "using namespace std;" in included files (Take 2)

lily/drum-note-engraver.cc

 /*
   This file is part of LilyPond, the GNU music typesetter.
 
   Copyright (C) 1997--2020 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
 
   LilyPond is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include <cctype>
-using namespace std;
 
 #include "item.hh"
 #include "duration.hh"
 #include "engraver.hh"
 #include "note-column.hh"
 #include "rhythmic-head.hh"
 #include "side-position-interface.hh"
 #include "script-interface.hh"
 #include "stem.hh"
 #include "stream-event.hh"
 #include "warn.hh"
 
 #include "translator.icc"
 
+using std::vector;
+
 class Drum_notes_engraver : public Engraver
 {
   vector<Item *> scripts_;
   vector<Stream_event *> events_;
 
 public:
   TRANSLATOR_DECLARATIONS (Drum_notes_engraver);
 
 protected:
   void process_music ();
@@ skipping 110 matching lines @@
                 /* create */
                 "NoteHead "
                 "Script ",
 
                 /* read */
                 "drumStyleTable ",
 
                 /* write */
                 ""
                );