Remove some lambdas from Utils::transform calls

It is often possible to user (member) functions or members directly.
That improves readablility and potentially reduces the total number of
symbols.
Also use qobject_container_cast at places where it is appropriate.

Change-Id: Ia2591bca356591e001e2c53eeebcf753e5bc3c37
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/vcsbase/wizard/vcscommandpage.cpp

@@ -87,9 +87,7 @@ Utils::WizardPage *VcsCommandPageFactory::create(JsonWizard *wizard, Id typeId,
         if (argsVar.type() == QVariant::String) {
             args << argsVar.toString();
         } else if (argsVar.type() == QVariant::List) {
-            args = Utils::transform(argsVar.toList(), [](const QVariant &in) {
-                return in.toString();
-            });
+            args = Utils::transform(argsVar.toList(), &QVariant::toString);
         } else {
             return 0;
         }