refs #392 Added BlackGui::IPluginConfig

* BlackGui::IPluginConfig is an interface for plugin configurations
* Added plugin_xplane_config target
* Adapted IPluginManager
* Adapted CPluginManagerSimulator
* Adaptem CSettingsSimulatorComponent

src/blackmisc/simulation/simulatorplugininfo.cpp

@@ -24,7 +24,6 @@ namespace BlackMisc
             if (json.contains("IID"))   // comes from the plugin
             {
                 // json data is already validated by CPluginManagerSimulator
-                Q_ASSERT(json["IID"].toString() == QStringLiteral("org.swift-project.blackcore.simulatorinterface"));
                 CValueObject::convertFromJson(json["MetaData"].toObject());
                 m_valid = true;
             }