Enables XTERM escape code \eO to allow using F1-F4 on a mac

[eikes]

Describe the change

It adds the XTERM escape code \eO

Why are we doing this?

The F1-F4 keys were not correctly detected on a MacOS terminal.

Benefits

The keys are correctly detected and can be used on MacOS (and any XTERM terminal I presume).

Drawbacks

Possible drawbacks applying this change.

Requirements

• [x] Tests written & passing locally?
• [x] Code style checked?
• [x] Rebased with master branch?
• [ ] Documentation updated?
• [ ] Changelog updated?