Make QShortcutMap accessable from public interface

The user wants to access the list of shortcuts set to the whole QApplication regardless a context used. The user found from the source-code that there is such a map:

#ifndef QT_NO_SHORTCUT
QShortcutMap shortcutMap;
#endif

However the user can see only one possibility here - including private-modules. The user however does not want to use any of private-modules.

As the title of this suggestion says, make the mentioned shortcutMap accessable.