Fix #371, #373, #374: Update exploration json to latest versions #390
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Fix #371.
Fix #373.
Fix #374.
All three of these issues were caused by the audio & image references being wrong in the fractions lessons, likely due to them being old. This PR updates fractions lessons so that each work correctly. It also adds some nice-to-have missing fields to all lessons, such as version and ID.
This also updates StateRetriever to remove legacy parsing code now that the fractions explorations are using the latest schema version.StateRetriever can't be updated yet since some of the questions structures appear to rely on this legacy parsing.
Verified all domain tests are passing.