Improve Latency

[radioation]

The current IR camera implementation latency is large. Its somewhat tolerable (T2, VirtuaCop) in some games and unacceptable in others (Atari 8 bit).

• check timings of entire loop: frame acquisition, image processing, pose estimation, etc
• Look at other camera models if frame acquisition is unacceptably slow
• Look at optimizing or replacing image processing and pose estimation steps.

[radioation]

1f9b6d3 Added code that uses cv::getPerspectiveTransform() to estimate intersection. Results appear comparable to cv::solvePnP() but generally faster to compute.

[radioation]

Reopening because I still need to look at other camera models and optimize or replace image processing stages.