Sanity-check the 'actor' position data

[brandonhackney]

TriCOPA comes with XY position data for each element on screen. Sajjad modified some of the videos for timing etc, so we need to verify that that data is still accurate.

• [x] Make a copy of the existing function that plots fixation data against video frames
• [x] Modify it to look at the XY coordinate data instead
• [x] Also modify it to draw that data for each video frame, i.e. not just when there's an 'update'
• [x] Review each movie to see how well the position vectors actually track the stimuli we're using

[brandonhackney]

The position data is temporally misscaled relative to the video data - that is, the position data first moves AFTER the video, but by the end moves BEFORE.

• [x] Need to find a way to stretch the position data in time to fit the length of the video.

[brandonhackney]

After intensive review, we've determined that only half of the position data the original authors provided is valid. Most of the leftover can be made valid with some manual adjustment, but 10% is just flat-out unusable. So we're giving up on the provided data. However, an ROI analysis is still a critical part of this experiment, so we're turning to computer vision applications to extract the position data for us instead.