Added Config::setDisabledPaintEvents()

Makes our internal widgets not override QWidget::paintEvent(),
which gives full power to the user to stylesheets.

Was already possible, but required the user to override the
internal widgets via the widget factory

For issue #146

src/Config.cpp

@@ -56,6 +56,7 @@ public:
     FrameworkWidgetFactory *m_frameworkWidgetFactory = nullptr;
     Flags m_flags = Flag_Default;
     InternalFlags m_internalFlags = InternalFlag_None;
+    CustomizableWidgets m_disabledPaintEvents = CustomizableWidget_None;
     qreal m_draggedWindowOpacity = Q_QNAN;
 };
 
@@ -292,4 +293,14 @@ void Config::Private::fixFlags()
     }
 }
 
+void Config::setDisabledPaintEvents(CustomizableWidgets widgets)
+{
+    d->m_disabledPaintEvents = widgets;
+}
+
+Config::CustomizableWidgets Config::disabledPaintEvents() const
+{
+    return d->m_disabledPaintEvents;
+}
+
 }