Text-Generator.io Support

[lee101]

Add support for https://text-generator.io as well as keeping the existing OpenAI support/compatibility.

Text Generator is more affordable and also researches input links so there may be benefits to that functionality (linked any images have OCR done as well as content analysis and or linked webpages are read to geenrate better text too ).

This seems to work but I didn't test this out much, i feel like the prompts should be shortened / made more concise e.g. we can drop the

<link id=17>Privacy</link>
<link id=18>Terms</link>

as the bot likely wont need to go there