fixes https://github.com/vircadia/vircadia/issues/1015
also:
* new mirror and controls poster model.
* moved controls poster so it would not be obscured by the wizzard.
* updated landing point.
* ambient music volume raised a bit, we may want to have a in-worrld toggle for this later https://github.com/vircadia/vircadia/issues/1016.
* turned the zone light up a bit so it is not so dark when on low graphic settings.
