Working on the connection manager.

Made a list model for displaying them in a list. Also added controles to edit
the most important properties.

connectionmanagerwindow.h

@@ -0,0 +1,30 @@
+#ifndef CONNECTIONMANAGERWINDOW_H
+#define CONNECTIONMANAGERWINDOW_H
+
+#include <QMainWindow>
+
+namespace Ui {
+class ConnectionManagerWindow;
+}
+
+class ConnectionListModel;
+
+class ConnectionManagerWindow : public QMainWindow
+{
+	Q_OBJECT
+
+public:
+	explicit ConnectionManagerWindow(QWidget *parent = 0);
+	~ConnectionManagerWindow();
+
+private slots:
+	void on_actionAdd_Connection_triggered();
+	void on_currentChanged(const QModelIndex &current, const QModelIndex &previous);
+	void on_actionDelete_connection_triggered();
+
+private:
+	Ui::ConnectionManagerWindow *ui;
+	ConnectionListModel *m_listModel = nullptr;
+};
+
+#endif // CONNECTIONMANAGERWINDOW_H