GH-2591 less std::shared_ptr and more shared_qobject_ptr

This eliminates some weird crashes.

application/LaunchController.h

@@ -57,5 +57,5 @@ private:
     QWidget * m_parentWidget = nullptr;
     InstanceWindow *m_console = nullptr;
     AuthSessionPtr m_session;
-    std::shared_ptr <LaunchTask> m_launcher;
+    shared_qobject_ptr<LaunchTask> m_launcher;
 };