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/qt4buildenvironmentwidget.cpp

@@ -40,7 +40,7 @@ using namespace Qt4ProjectManager;
 using namespace Qt4ProjectManager::Internal;
 
 Qt4BuildEnvironmentWidget::Qt4BuildEnvironmentWidget(Qt4Project *project)
-    : BuildStepConfigWidget(), m_pro(project)
+    : BuildConfigWidget(), m_pro(project)
 {
     QVBoxLayout *vbox = new QVBoxLayout(this);
     vbox->setMargin(0);