refs #418, ICAO data for reader

* value objects and respective lists
* adjusted CAircraftIcao to use new classes
* some smaller fixes, Doxygen
* reader for values from database JSON values
  http://vatrep.vatsim-germany.org/service/allaircrafticao.php?rows=10000&sord=asc
* Related: Slightly improved signals for VATSIM reader

src/blackmisc/aviation/airlineicaocodelist.h

@@ -0,0 +1,50 @@
+/* Copyright (C) 2015
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKMISC_AVIATION_AIRLINEICAOCODELIST_H
+#define BLACKMISC_AVIATION_AIRLINEICAOCODELIST_H
+
+#include "airlineicaocode.h"
+#include "blackmisc/blackmiscexport.h"
+#include "blackmisc/collection.h"
+#include "blackmisc/sequence.h"
+#include <initializer_list>
+
+namespace BlackMisc
+{
+    namespace Aviation
+    {
+        //! Value object encapsulating a list of ICAO codes.
+        class BLACKMISC_EXPORT CAirlineIcaoCodeList :
+            public CSequence<CAirlineIcaoCode>,
+            public BlackMisc::Mixin::MetaType<CAirlineIcaoCodeList>
+        {
+        public:
+            BLACKMISC_DECLARE_USING_MIXIN_METATYPE(CAirlineIcaoCodeList)
+
+            //! Default constructor.
+            CAirlineIcaoCodeList() = default;
+
+            //! Construct from a base class object.
+            CAirlineIcaoCodeList(const CSequence<CAirlineIcaoCode> &other);
+
+            //! From our DB JSON
+            static CAirlineIcaoCodeList fromDatabaseJson(const QJsonArray &array);
+        };
+
+    } //namespace
+} // namespace
+
+Q_DECLARE_METATYPE(BlackMisc::Aviation::CAirlineIcaoCodeList)
+Q_DECLARE_METATYPE(BlackMisc::CCollection<BlackMisc::Aviation::CAirlineIcaoCode>)
+Q_DECLARE_METATYPE(BlackMisc::CSequence<BlackMisc::Aviation::CAirlineIcaoCode>)
+
+#endif //guard