Rework the project settings.

This has still a few missing things, but this enough to start getting
some feedback. Missing are non qt projects, a solution for the
runconfiguration, a missing black line between the treeview on top and
the project settings at the bottom. Some flickering with removing/adding
widgets to the QScrollArea and not showing the expanded widget if the
Details button is right at the bottom.

src/plugins/qt4projectmanager/qt4nodes.cpp

@@ -891,6 +891,7 @@ ProFileReader *Qt4PriFileNode::createProFileReader() const
         reader->setQtVersion(version);
 
     reader->setOutputDir(m_qt4ProFileNode->buildDir());
+    reader->setCumulative(false);
 
     return reader;
 }