Reorganize and prepare for SDL integration

app/gui/mainwindow.h

@@ -0,0 +1,33 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QtWidgets>
+
+namespace Ui {
+class MainWindow;
+}
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    explicit MainWindow(QWidget *parent = 0);
+    ~MainWindow();
+
+protected:
+    void closeEvent(QCloseEvent *event) override;
+
+private slots:
+    void on_actionExit_triggered();
+    void on_newHostBtn_clicked();
+    void addHostToDisplay(QMap<QString, bool>);
+    void on_selectHostComboBox_activated(const QString &);
+
+private:
+    Ui::MainWindow *ui;
+
+};
+
+#endif // MAINWINDOW_H