Added icons to options dialog categories

Some categories do not have icons yet, unfortunately.

src/plugins/debugger/gdb/gdboptionspage.cpp

@@ -62,6 +62,11 @@ QString GdbOptionsPage::displayCategory() const
     return QCoreApplication::translate("Debugger", Debugger::Constants::DEBUGGER_SETTINGS_TR_CATEGORY);
 }
 
+QIcon GdbOptionsPage::categoryIcon() const
+{
+    return QIcon(QLatin1String(Debugger::Constants::DEBUGGER_COMMON_SETTINGS_CATEGORY_ICON));
+}
+
 QWidget *GdbOptionsPage::createPage(QWidget *parent)
 {
     QWidget *w = new QWidget(parent);