Moved "Copy metadata unchanged" to PP3, and added "strip metadata" mode

Fixes #3647

rtgui/metadatapanel.h

@@ -0,0 +1,48 @@
+/** -*- C++ -*-
+ *  
+ *  This file is part of RawTherapee.
+ *
+ *  Copyright (c) 2017 Alberto Griggio <alberto.griggio@gmail.com>
+ *
+ *  RawTherapee 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.
+ *
+ *  RawTherapee 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 RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include <gtkmm.h>
+#include "toolpanel.h"
+#include "exifpanel.h"
+#include "iptcpanel.h"
+
+class MetaDataPanel: public Gtk::VBox, public ToolPanel {
+private:
+    rtengine::ProcEvent EvMetaDataMode;
+    MyComboBoxText *metadataMode;
+    Gtk::Notebook *tagsNotebook;
+    ExifPanel *exifpanel;
+    IPTCPanel *iptcpanel;
+
+    void metaDataModeChanged();
+
+public:
+    MetaDataPanel();
+    
+    void setBatchMode(bool batchMode);
+    void read(const rtengine::procparams::ProcParams* pp, const ParamsEdited* pedited = nullptr);
+    void write(rtengine::procparams::ProcParams* pp, ParamsEdited* pedited = nullptr);
+    void setDefaults(const rtengine::procparams::ProcParams* defParams, const ParamsEdited* pedited = nullptr);
+
+    void setImageData(const rtengine::FramesMetaData* id);
+    void setListener(ToolPanelListener *tpl);
+};
+