Copilot++ improvements:

1. Caching — add and delete a letter and the suggestion will still be there for you!

2. Do not interfere with intellisense and cmd-k.

3. Fixes bugs with lag on large files and with the blue highlight staying around.

4. Copilot++ sees your lint errors and will use this to improve its suggestions

Cursor is now based on VS Code 1.84.2. Notably, this fixes a few notebook bugs, and ensures that all of the most recent extensions work.