Pref: - add require-reboot capability to PreferencePage.

- Implement this require-reboot in wb pref page

src/Gui/PropertyPage.cpp

@@ -96,7 +96,7 @@ void PropertyPage::onReset()
 // ----------------------------------------------------------------
 
 /** Construction */
-PreferencePage::PreferencePage(QWidget* parent) : QWidget(parent)
+PreferencePage::PreferencePage(QWidget* parent) : QWidget(parent), rebootRequired(false)
 {
 }
 
@@ -105,6 +105,18 @@ void PreferencePage::changeEvent(QEvent* event)
     QWidget::changeEvent(event);
 }
 
+bool PreferencePage::isRebootRequired()
+{
+    return rebootRequired;
+}
+
+void PreferencePage::requireReboot()
+{
+    rebootRequired = true;
+}
+
+
+
 // ----------------------------------------------------------------
 
 PreferenceUiForm::PreferenceUiForm(const QString& fn, QWidget* parent)