[PlayRaw] RAW Challenge: Backlit

[patdavid]

Per @Claes suggestion/request, I’ve moved all of the LUT discussions over to the other thread:

About the new Color checker LUT module in DT

In case you have missed the discussion (with examples) in the development branch, here is a link to it: https://discuss.pixls.us/t/raw-challenge-backlit/1676/50?u=claes