Remove QtWidgets dependencies from QtMacExtras.

This makes it possible to use QtMacExtras from other
modules without adding a QtWidgets dependency. It
also makes it possible to use QtMacExtras from
QtWidgets.

Widget-related classes and functions will be added
to QtWidgets.

Specifics:

Make QMacNativeToolBar private, for use by QMainWindow::
setUnifiedTitleAndToolBarOnMac(). Remove the QAction
based APIs. Remove the example. We can make QMacNativeToolBar
public again when the API is ready and documented.

Remove misc functions: toNSMenu, setDockMenu,
isMainWindow.

Make toCfSTring/Url private pending inclusion into
QtCore.

Change-Id: Ic55e78d8ef923149c23884f6589732f7dfb94153
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>

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