Use exiv2 for metadata handling

rtengine/procparams.h

@@ -1075,90 +1075,8 @@ struct MetaDataParams {
 };
 
 
-/**
-  * Minimal wrapper allowing forward declaration for representing a key/value for the exif metadata information
-  */
-class ExifPairs final
-{
-public:
-    using const_iterator = std::map<Glib::ustring, Glib::ustring>::const_iterator;
-
-    const_iterator begin() const
-    {
-        return pairs.begin();
-    }
-
-    const_iterator end() const
-    {
-        return pairs.end();
-    }
-
-    void clear()
-    {
-        pairs.clear();
-    }
-
-    Glib::ustring& operator[](const Glib::ustring& key)
-    {
-        return pairs[key];
-    }
-
-    bool operator ==(const ExifPairs& other) const
-    {
-        return pairs == other.pairs;
-    }
-
-private:
-    std::map<Glib::ustring, Glib::ustring> pairs;
-};
-
-/**
-  * The IPTC key/value pairs
-  */
-class IPTCPairs final
-{
-public:
-    using iterator = std::map<Glib::ustring, std::vector<Glib::ustring>>::iterator;
-    using const_iterator = std::map<Glib::ustring, std::vector<Glib::ustring>>::const_iterator;
-
-    iterator find(const Glib::ustring& key)
-    {
-        return pairs.find(key);
-    }
-
-    const_iterator begin() const
-    {
-        return pairs.begin();
-    }
-
-    const_iterator end() const
-    {
-        return pairs.end();
-    }
-
-    bool empty() const
-    {
-        return pairs.empty();
-    }
-
-    void clear()
-    {
-        pairs.clear();
-    }
-
-    std::vector<Glib::ustring>& operator[](const Glib::ustring& key)
-    {
-        return pairs[key];
-    }
-
-    bool operator ==(const IPTCPairs& other) const
-    {
-        return pairs == other.pairs;
-    }
-
-private:
-    std::map<Glib::ustring, std::vector<Glib::ustring>> pairs;
-};
+typedef std::map<Glib::ustring, Glib::ustring> ExifPairs;
+typedef std::map<Glib::ustring, std::vector<Glib::ustring>> IPTCPairs;
 
 struct WaveletParams {
     std::vector<double> ccwcurve;