Use runtime2 and correct surface format.

Task-number: QT3DS-1646

Some QML side cleanups.

Task-number: QT3DS-1050

Copied files that control KNX board from
code.qt.io/cgit/qt/qtknx.git/tree/examples/knx/demo
There's a config variable, KNX_BOARD, added that can be used to define
if KNX backend should be used. The backend is not yet connected in to
the demo, only the files are copied at this point.

Added Home Automation demo for Qt 3D Studio 1.0.0

Task-number: QT3DS-291