Polish the widgets/mainwindows/mdi example.

- Introduce Qt 5 signals & slot syntax and remove the QSignalMapper
  used to map the triggered() signals of the per-MDI-child actions
  of the window menu to the activation slot by a functor to demonstrate
  the flexibility of the new connection syntax (the functor can
  in turn be replaced by a lambda expression once we have C++ 11).
- Merge MainWindow::createMenus()/createQToolBars()
  into MainWindow::createActions(), removing the need
  to store the actions as member variables.
  Use QMenu::addAction() for brevity.
- Use QIcon::fromTheme() to obtain system icons and use
  resource icons as fallback.
- Rewrite settings code to use
  QWidget::saveGeometry(), Widget::restoreGeometry() since
  saving size and position does not work well with multiple
  screens. Query the available size when determining
  the initial size instead of using hard-coded values
  for High-DPI screens.
- Fix minor issues in code, use multi-argument version
  of QString::arg(), QDir::toNativeSeparators() to
  present file paths to the user and static method invocation.

Change-Id: I3d5078ddbe3cb4eba65e188430ba3580cecb2c79
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

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