Working on pushing the mirror camera back to prevent intersecting the near
clip plane.  Closes #2617.
Use the head height to determine the pushback amount.
Head height's kind of screwy; let's use the eye position.
Missed a spot.
Better radius.
Slip in a fix for Windows build warnings on mtc-generated code.
Merge pull request #2622 from ey6es/master

Pull camera back to avoid head's intersecting near clip plane in full screen mirror mode.