Third batch of QJSValue changes.

All QObject output values are now wrapped in to QJSValues and
input QObject values are treated as QJSValues. Id property removed
from the Program3D object as that shouldn't be exposed to the JS side.

Change-Id: I424ec946554150e06adb30bff8be968ec832e998
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>