[update] update to upstream commit 30879a6
Squashed 'qt3d/' changes from 0158ce7..30879a6

30879a6 Viewport: handle the situation when Scenegraph is already initialized.
ed279e4 Replaced Nokia copyrights in header
d7cc089 Update qmldir files
d20ac9d Update all plugins.qmltypes files

git-subtree-dir: qt3d
git-subtree-split: 30879a64cd4fccb99fe399a4d4c23de4f61b7d37
Merge commit '325162564ce5937611a241a191baab8422e0eb08'