More escapes! fun!

[boneskull]

iTerm supports many proprietary escapes, and it might be cool to implement more of them.

There's also a bunch of "OSC" escapes which various terminals implement, though it's unclear to me if those escape codes are standardized in any way. It's seemingly non-trivial to get a list of which of these any given terminal supports...

For example, OSC 9 seems to be "Growl notification" as implemented by iTerm, hterm, and probably others--but I'm going to wager that implementing terminal sniffing is better suited to higher-level modules (e.g., term-img-cli).

If you're amenable to adding stuff, I'm curious:

1. if there's anything in particular you want to avoid, and
2. how one should go about testing any new additions

Thanks!

[sindresorhus]

1. I want to avoid adding additional dependencies.
2. I don't think there's any way to test these other than manually.