Fixes the bug where all folders are switched to lowercase when using @ folder in chat.

1. Better context chat: in particular, followups are now smarter!
2. Faster Copilot++: a few hundred milliseconds faster, through various networking optimizations. We still have several hundred additional milliseconds to cut here.
3. More reliable Copilot++ changes: less flashing, better highlighting of what's new.

• Image Support in Chat: You can now drag and drop images into the chat to send them to the AI.
• Interpeter Mode Beta: You can now enable Interpreter Mode in the "More" tab. This gives the chat access to a Python notebook, semantic search, and more tools.
• @ folders: You can now use the @ symbol to reference specific folders! We'll try to pick out the most relevant code snippets to show the AI.
• Copilot++ Improvements: We've spent some time improving the latency of Copilot++, and you can change the Copilot++ keybinding to not be Option/Alt. More to come here soon, especially on the model itself!

Fixes a bug where the interpreter mode just wouldn't run at all on Windows.