Blender Git Loki

Fix T37172: Plane Tracker Deform - No perspective

Previous wrap implementation was based on inverse
bilinear mapping, which doesn't give perspective.

Now plane track wrap estimates perspective transform
matrix as a homography estimation between frame
coordinates and plane corners.

Uses Libmv's implementation for this, which means
plane track wouldn't work properly with Libmv
disabled. Not a deal for official builds at all,
just folks who keeps things disabled need to be
aware of this.