feat: change buttonsView

* add buttonsView common(complete)
* add buttonsView instructor(notWorking)
* BUGFIX sendSystem meth update files
* BUGFIX updateController meth checkNeedUpdate

instructorbuttongroupwidget.h

@@ -0,0 +1,34 @@
+#ifndef INSTRUCTORBUTTONGROUPWIDGET_H
+#define INSTRUCTORBUTTONGROUPWIDGET_H
+
+#include <QWidget>
+#include "mainwindow.h"
+
+namespace Ui {
+class InstructorButtonGroupWidget;
+}
+
+class MainWindow;
+
+class InstructorButtonGroupWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit InstructorButtonGroupWidget(QWidget *parent = nullptr);
+    void initialize(MainWindow *mainWindow);
+    ~InstructorButtonGroupWidget();
+
+private slots:
+    void on_loadToServerButton_clicked();
+
+    void on_undoChangesButton_clicked();
+
+    void on_startWithCurrentChangesButton_clicked();
+
+private:
+    Ui::InstructorButtonGroupWidget *ui;
+    MainWindow *mainWindow;
+};
+
+#endif // INSTRUCTORBUTTONGROUPWIDGET_H