Candidates for standards we could be migrating here

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There are some candidates for specs we could migrate here:

https://github.com/systemd/systemd/blob/main/docs/OSC_CONTEXT.md

varlink.io specs

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I prepped a PR for the OSC context stuff now: #202

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Another candidate might be https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda (i.e. OSC 8 terminal hyperlinks)