multiview: Add option to swap left/right stereo channels to interlace display method (UI only)
Merge pull request #26 from Alexey-Akishin/n5

multiview: Add option to swap left/right stereo channels to interlace display method (UI only)

At some point it may be better to move all the stereo related props to its own "struct' (e.g., scene.render.stereo. ....).
but for now let's get things working first