Add data.json load for keywords

[bovard]

If data.json is detected, load the keywords from it.

     {
        "action": "",
        "info": {},
        "observation": {
          "answers": [
            "no"
          ],
          "category": "things",
          "guesses": [
            "banana"
          ],
          "keyword": "banana",
          "questions": [
            "Is it a thing?"
          ],
          "remainingOverageTime": 300,
          "role": "answerer",
          "turnType": "answer"
        },
        "reward": 20,
        "status": "DONE"
      }

[dster2]

Thanks Bovard!

[dster2]

nit: I imagine it's unlikely, but would be weird if you had an exception in the later portion of this chunk, for example a missing key in the keyword_obj dict, then we'd have inconsistencies in the datasets. You could limit the try to only the open call, or other approaches.