Support more than just text

[dmwyatt]

Chromium supports "web custom formats" for the clipboard which should allow us to write data in multiple formats to the clipboard.

As of right now, the only chatbot that I'm aware of that supports pastes of multi-format input is Google's AI Studio (maybe just with Gemini 1.5 Pro). If you copy/paste content with text and images (try copy/pasting a web page), the images are also inserted.

So, a user should be able to give us content with text and images and maybe even more, and we should support outputting it via clipboard in a format that embeds this content.