* GUI: Follow the widget indications when docking them
The overlay manager handles the creation and drawing of the title bars
for the docked widgets. When adding a QDockWidget the manager ignored
the set of features (closable, movable, floatable) provided by the
widget and always showed all the actions.
Amend the code to take into account the features specified by the
widget.
Closes#11944
* QMetaObject::invokeMethod: No such method Gui::OverlayManager::raiseAll()
* variable 'total' set but not used [-Wunused-but-set-variable]
* 'globalPos' is deprecated: Use globalPosition() [-Wdeprecated-declarations]
