macOS Touch Bar support

• I have searched the issues of this repo and believe that this is not a duplicate

So, iTerm recently landed support for the macOS Touch Bar (in that programs hosted in the terminal can create display-buttons for the touch bar that display custom content, and send a function-key such as F1..F12 to the terminal when tapped.)

The implementation uses iTerm2's 1337 escape-code with the SetKeyLabel, PushKeyLabels, and PopKeyLabels keys.

For instance, printing ESC+]1337;SetKeyLabel=F1=Save & Quit+BEL will cause iTerm2 to display a Touch Bar button with the text “Save & Quit”, that when tapped, sends to the application.

One example usage of this functionality is demonstrated here, where some of the cruft traditionally included in the command-line prompt is moved into the Touch Bar:

I'd love to see this support validated and duplicated by Hyper, given how cutting-edge Hyper tends to be in other ways.

The issue names no files or tests. Start by locating Hyper's macOS terminal integration and the handling of iTerm2's 1337 escape codes; compare the SetKeyLabel, PushKeyLabels, and PopKeyLabels behavior described here. Done means Hyper can expose the requested Touch Bar buttons and send function-key events to terminal applications.