Let's try actually using the average eye position as the camera location for
first person and mirror mode.
Merge branch 'master' of https://github.com/worklist/hifi
Need to set lookat position to camera position before simulating in mirror
mode.
Use calculated eye position here.
Smooth gaze direction relative to window.
Merge branch 'master' of https://github.com/worklist/hifi
Merge pull request #1119 from ey6es/master

Gaze adjustments: use the eye positions from the face model, subtract long term average relative to window (not head).