Remove obsolete plugin storage

Plugin storage was used before the value cache existed. With the
value cache this is no longer used and can be removed.

refs #660

src/plugins/simulator/fscommon/simulatorfscommon.cpp

@@ -27,10 +27,9 @@ namespace BlackSimPlugin
             const CSimulatorPluginInfo &info,
             IOwnAircraftProvider *ownAircraftProvider,
             IRemoteAircraftProvider *renderedAircraftProvider,
-            IPluginStorageProvider *pluginStorageProvider,
             Weather::IWeatherGridProvider *weatherGridProvider,
             QObject *parent) :
-            CSimulatorCommon(info, ownAircraftProvider, renderedAircraftProvider, pluginStorageProvider, weatherGridProvider, parent),
+            CSimulatorCommon(info, ownAircraftProvider, renderedAircraftProvider, weatherGridProvider, parent),
             m_fsuipc(new CFsuipc())
         { }