QmlProject: Update code model if kit configuration changes

Update code model if e.g. the Qt version in the active kit changes.

Task-number: QTCREATORBUG-10656
Change-Id: I4263833c23c2b00035d15faa9725adbb734f8366
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/qmlprojectmanager/qmlproject.h

@@ -98,6 +98,7 @@ private slots:
     void refreshFiles(const QSet<QString> &added, const QSet<QString> &removed);
     void addedTarget(ProjectExplorer::Target *target);
     void onActiveTargetChanged(ProjectExplorer::Target *target);
+    void onKitChanged();
     void addedRunConfiguration(ProjectExplorer::RunConfiguration *);
 
 protected:
@@ -114,6 +115,7 @@ private:
     QString m_projectName;
     QmlImport m_defaultImport;
     QmlJS::ModelManagerInterface *m_modelManager;
+    ProjectExplorer::Target *m_activeTarget;
 
     // plain format
     QStringList m_files;