Three.js examples were placed in the root of Qt examples folder,
this moves them to be under canvas3d as they should be.

Change-Id: I506685d8a147975bc137fbac3b22d8ce28639631
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

Moves the Canvas3D examples from main examples"folder in
the Qt builds to Canvas3D subfolder.

Change-Id: Ib033db671a6ac790a1d7f659bdb13755fe7806ea
Task-number: QTBUG-45948
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>

Fixes the look'n'feel of the examples to be in line with the new Qt logo and website.
Instead of changing the simple texture and light example it was decided to add a new example
that shows how to combine QtQuick 2D UI with three.js based 3D rendering.

Change-Id: Ie3a21b03f8aa850ceae93252a764bd0d3264e229
Task-number: QTBUG-45696
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>