If \wrapper appears in a \class comment or a
\qmltype comment, qdoc will not print warnings
when it finds public members of the class or the
QML type that are not documented.

The \wrapper command is added to several
opengl classes. This reduces the number of
qdoc warnings by several thousands.

Task-number: QTBUG-30755
Change-Id: Iba1eebc1590ccf54100e40fe91423240c1b3d09d
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Reviewed-by: Venugopal Shivashankar <venugopal.shivashankar@digia.com>
Reviewed-by: Martin Smith <martin.smith@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>