Made it possible to make Qt Creator smaller, based on scroll areas

Scroll areas were added to the welcome mode and the project mode, to
make sure they don't limit how small Qt Creator can be made.

Done with mae

src/plugins/cmakeprojectmanager/cmakerunconfiguration.cpp

@@ -253,7 +253,7 @@ CMakeRunConfigurationWidget::CMakeRunConfigurationWidget(CMakeRunConfiguration *
     fl->addRow(tr("Working Directory:"), boxlayout);
 
     QGroupBox *box = new QGroupBox(tr("Environment"),this);
-    QVBoxLayout *boxLayout = new QVBoxLayout();
+    QVBoxLayout *boxLayout = new QVBoxLayout;
     box->setLayout(boxLayout);
     box->setFlat(true);