Add clickable hyperlinks when URLs are on screen

I noticed that in some terminals like Gnome, printed URLs become clickable from within the GUI. I know that you can use the following with an OSC sequence to make a clickable URL:

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

When this is split across multiple lines, more sequences can be attached. That "This is a link" text could very easily be replaced with the URL itself again to act as [http://example.com](http://example.com) does in markdown.

Somewhere in TextBuffer::render, you could leverage the searching functionality you already have to compare against some URL regex found online (see here) and then inject this additional OSC sequence to be printed to the TTY.

Start in TextBuffer::render and inspect the existing searching functionality. Review the OSC hyperlink example and the linked URL-regex reference, then determine how URLs spanning rendered lines should be handled. Done means URLs shown in the terminal are wrapped with OSC hyperlink sequences while preserving the displayed URL text.