Working on plane collisions, pushing back camera from intersecting avatars.
Merge branch 'master' of https://github.com/highfidelity/hifi
More plane intersection bits.
Trying out basic pushback for other avatars.
More intersection-avoidance tweaks.
Merge branch 'master' of https://github.com/highfidelity/hifi
Fall intersection off with angle to other avatar.
Better rolloff.
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge pull request #2649 from ey6es/master

Experimental "pushback" to avoid other avatars' intersecting the near clip plane.