Ref T215, remember last server and model as cache value

* also remember last server not VATSIM server
* remember last model used
* server list selector uses remembered value
* login component sets those values

src/blackmisc/simulation/data/lastmodel.h

@@ -0,0 +1,37 @@
+/* Copyright (C) 2017
+ * 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_SIMULATION_DATA_LASTMODEL_H
+#define BLACKMISC_SIMULATION_DATA_LASTMODEL_H
+
+#include "blackmisc/simulation/aircraftmodel.h"
+#include "blackmisc/datacache.h"
+
+namespace BlackMisc
+{
+    namespace Simulation
+    {
+        namespace Data
+        {
+            //! Last model used
+            struct TLastModel : public BlackMisc::TDataTrait<CAircraftModel>
+            {
+                //! \copydoc BlackCore::TSettingTrait::key
+                static const char *key() { return "lastaircraftmodel"; }
+
+                //! \copydoc BlackCore::TSettingTrait::humanReadable
+                static const QString &humanReadable() { static const QString name("Own aircraft model"); return name; }
+            };
+        } // ns
+    } // ns
+} // ns
+
+#endif // guard

src/blackmisc/simulation/data/modelcaches.h

@@ -29,7 +29,7 @@ namespace BlackMisc
         namespace Data
         {
             //! Trait for model cache
-            struct TModelCache : public BlackMisc::TDataTrait<BlackMisc::Simulation::CAircraftModelList>
+            struct TModelCache : public TDataTrait<CAircraftModelList>
             {
                 //! Defer loading
                 static constexpr bool isDeferred() { return true; }