fix screen quirks

The `screen` utility behaves in funny ways. * [ ] Ctrl+E, Ctrl+K hotkeys are being mangled by screen (macOS and Ubuntu) * [ ] many colors are wrong (Ubuntu) * [ ] the screen session ID isn't parsing properly (Ubuntu) Ctrl+A is also taken, though that one is ingrained even more deeply into screen hotkey defaults (e.g. `Ctrl+A, D` for detach).