Add threaded session backend architecture with real SSH backend

src/session_window.h

@@ -6,6 +6,7 @@
 #include <QMainWindow>
 
 class QTabWidget;
+class SessionTab;
 
 class SessionWindow : public QMainWindow
 {
@@ -18,6 +19,7 @@ private:
     QTabWidget* m_tabs;
 
     void addSessionTab(const Profile& profile);
+    void updateTabTitle(SessionTab* tab, const QString& title);
 };
 
 #endif