Update models and OpenAI client version to V4

[tokreutz]

This pullrequest contains:

• Updating the OpenAI GPT models to their model names from https://platform.openai.com/docs/models/overview
• Added the response_format support to the settings
  • Allows to toggle between text and json responses. Seems very useful for processing response data in flows.
  • https://platform.openai.com/docs/api-reference/chat/create#chat-create-response_format
• Updating the OpenAI client to version 4.
  • This version had breaking changes on the request and response models.
  • I did this to support the additional respose_format parameter to the chat completion api

There are still references to a lot of deprecated models in the app flow path in app.js. This list should also be pruned down to only support the latest chat completions api only.

[tokreutz]

@frodeheg here are the changes to deprecate completion bot, update models, and some more.

Seems to work for me, but there sre still some updates required to app.js to remove ability to select deprecated models and APIs.