use whole Touch Bar as ESC on new MBPR

Thanks for filing an issue! Please answer the questions below so I can help you.

• OS version: macOS

Detailed steps to reproduce the problem:

1. Locate ESC key on your new MBPR
2. I cannot find it.

What happened: ESC key is gone on new MBPR with Touch Bar

What should have happened: We should fix it by made whole Touch Bar into a giant ESC key to fix this usability problem and to reach maximum producibility.