Fix up tabbed browser example.

  * Replaces deprecated Q_WS_MAC preprocessor defines.
  * Adds a command line parser.
  * Adds Digia Qt home page to the default bookmarks.
  * Removes dead Q_WS_QWS flagged code.

Task-number: QTBUG-38069
Change-Id: If4ef67434c76c2ea096fa1250a9ffaa0e53e47dd
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@digia.com>
Fix up Fancy Browser example.

  * Prevent leaking of MainWindow.
  * Use proper command line argument parsing.
  * Make the Qt project page the default page.

Task-number: QTBUG-38069
Change-Id: I6142ca207e659e47136e47e4d5817dfa617677e8
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@digia.com>