Fix several clazy issues:

* C++11 range-loop might detach Qt container [-Wclazy-range-loop-detach]

src/Gui/PropertyView.cpp

@@ -161,7 +161,8 @@ bool PropertyView::showAll() {
 void PropertyView::setShowAll(bool enable) {
     if(_ShowAll != enable) {
         _ShowAll = enable;
-        for(auto view : getMainWindow()->findChildren<PropertyView*>()) {
+        const auto views = getMainWindow()->findChildren<PropertyView*>();
+        for(auto view : views) {
             if(view->isVisible()) {
                 view->propertyEditorData->buildUp();
                 view->propertyEditorView->buildUp();