The spatial room doesn't respond to device orientation changes

[colinbdclark]

On mobile devices, when you change the orientation between portrait and landscape (or vice versa), Audimance's spatial room layout doesn't change until the user taps somewhere in the room to change their position.

There is a relatively recent web standard API, the ScreenOrientation API, for detecting screen orientation changes. It has strong cross-browser support now, too, so it should be safe to use conditionally so that we don't break very old devices.

We should update room.js to redraw its layout whenever the screen orientation change event fires.