Document escape sequences implemented by foot
Add a new man page that documents the escape sequences implemented by foot.
For well established sequences, a brief summary is all that is needed, but for foot's custom sequences, more details should be provided: both how the sequences work, and in what context they are intended to be used.
- OSC 555: flashes the entire screen
- OSC 777;notify: desktop notifications. This is strictly speaking not foot specific, but also much less established than "normal" escapes (#236)
- DECSET 27127: modifies the Esc key to emit
- DECSET 737769: enables/disables IME input
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