Added DockWidgetBase::setUserType(int)

This is an opaque value which KDDW won't try to interpret or do
anything with it other than forward it to the FrameworkWidgetFactory.

Which if specialized by the user he can have different title bars
for different said "dock widget types"

src/DockWidgetBase.cpp

@@ -778,6 +778,16 @@ DockWidgetBase *DockWidgetBase::deserialize(const LayoutSaver::DockWidget::Ptr &
     return dw;
 }
 
+void DockWidgetBase::setUserType(int userType)
+{
+    d->m_userType = userType;
+}
+
+int DockWidgetBase::userType() const
+{
+    return d->m_userType;
+}
+
 LayoutSaver::DockWidget::Ptr DockWidgetBase::Private::serialize() const
 {
     auto ptr = LayoutSaver::DockWidget::dockWidgetForName(q->uniqueName());
@@ -859,7 +869,6 @@ Frame *DockWidgetBase::Private::frame() const
     return nullptr;
 }
 
-
 void DockWidgetBase::Private::saveLastFloatingGeometry()
 {
     if (q->isFloating() && q->isVisible()) {