Mouse tracking

[BeritJanssen]

We might add a plugin to follow the mouse movements of users.

[drikusroor]

Do we still want to do this? And do we want to track mouse movement history of individual users, or heat maps per user, or average heat maps for all users per experiment per trial?

[jaburgoyne]

Data could be unwieldy, and so we would want this to be customisable per experiment (and off by default)