Support hyperlinks

I'm using picnic to print out tables for a command line tool. On some tables, I'd like to have hyperlink support. Do you have any ideas / suggestion how to have them clickable by iTerm?

iTerms and other consoles have support for links:

```
printf '\e]8;;http://example.com\e\\This is a link\e]8;;\e\\\n'
```

[Source](https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda)

Start by tracing picnic's table-to-text rendering entry point and compare its output with the OSC 8 escape sequence shown in the issue. Done means tables can represent hyperlinks that render as clickable links in iTerm and other terminals supporting this sequence.

Written by the indexing model from the issue text.