These classes will not be public until Qt 5.1.
This change marks a few things internal, so they
don't cause qdoc errors in Qt 5.0. It also adds
a few qdoc comments for future use in Qt 5.1.
Change-Id: If90692b97653223d8a986f2ae1fff49c20cd444b
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@nokia.com>