UPDATE: Fixed unified_chat file for all related projects (Patreon)

I updated the unified_chat file for all projects which uses this file such as "GPT_Perplexity" researcher and others so that the code will run even if you doN't have the API keys for all models set. Currently you have to set your API keys as environment variables. I will be working on a solution where you can set manually or from a .env file. 

Also updated the requirements.txt file with streamlit

hERE ARE ALL THE PROJECTS UPDATED:
https://www.patreon.com/posts/all-code-files-4-95306025

https://www.patreon.com/posts/code-files-ui-4-95306048

https://www.patreon.com/posts/code-files-for-4-94862039

https://www.patreon.com/posts/all-code-files-4-94763952

https://www.patreon.com/posts/unified-chat-for-94763951