Make it right handed

This change removes the option to set the orientation of the nodes in
the scene. The default will now be that all front-end nodes are in a
right handed coordination system; the same as the back-end nodes.

[ChangeLog] The coordinate system is now right-handed.

Fixes: QTBUG-77608
Change-Id: I5cb7dd0adb4816d4c835e070448865c11ad21994
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>
Reviewed-by: Andy Nichols <andy.nichols@qt.io>