Backwards-incompatible change:

On infant-controlled frames (exp-lookit-video-infant-control, exp-lookit-images-audio-infant-control), the lookawayTone now needs to be either (a) a list of source/type objects saying where to find an audio file parameter is or (b) a string relative to the baseDir. This lets you use custom audio for the lookawayTone, but you will need to make the following changes:
- If using lookawayTone 'none', change to ''.
- If using lookawayTone 'noise' or 'tone', either copy those files from https://www.mit.edu/~kimscott/placeholderstimuli/ to your own hosting location (baseDir) OR set lookawayTone to [{"src": "https://www.mit.edu/~kimscott/placeholderstimuli/mp3/noise.mp3", "type": "audio/mp3"}] (similarly for 'tone').

Minor changes

Bring up exit dialogue upon pressing Esc rather than just F1/ctrl-X (you can now instruct parents to press Escape to exit the study early, which is probably more intuitive than F1)
Dependency updates for security
Add Dutch translations of frame text (you can now set language: 'nl' on any frame)
exp-lookit-stimuli-preview: Add requirePreview option; if set to true then the participant doesn't have the option to skip the preview
exp-lookit-instruction-video: Center images in transcript of and allow to be at most 75% of transcript width
Add integration test for one frame as an example

Bugfix: camera couldn't be set up on a frame immediately following a video-assent frame that was skipped due to the child's age
Bugfix: pop_random example function now actually returns a random element (+ tests)