Implemented small button for every StripsWidget

plugins/advancedviewplugin/advancedviewwidget.cpp

@@ -0,0 +1,10 @@
+#include "advancedviewwidget.h"
+
+#include "mainwindow.h"
+
+AdvancedViewWidget::AdvancedViewWidget(MainWindow &mainWindow) :
+    QToolButton(&mainWindow),
+    m_mainWindow(mainWindow)
+{
+    setText(tr("X"));
+}