Use LLM to simplify explanations

[Gauntlet173]

There are now open source LLMs that can be used to simplify text ala ChatGPT. We should explore using them to simplify the explanations that Blawx is generating.

[Gauntlet173]

Check if #420 is necessary or helpful.

[Gauntlet173]

I tried this with some open-source LLM models, but they weren't powerful enough to summarize Blawx's explanations. That may change in future, but for now it's an issue. So I have implemented a system whereby the scenario editor will summarize your explanations using ChatGPT3.5 if you provide an OPENAI_API_KEY environment variable, and otherwise it won't. I need to clean up the interface when the key is not defined, and update the documentation, but it is well on its way to being complete.

[Gauntlet173]

Done in v1.6.15-alpha