Support rendering enhancement data

[ali1234]

The enhancement data can't be displayed when writing individual packets to stdout - it would require rewinding the terminal and editing previous packets. However it should be possible to support them in interactive, html, and url commands.

No timeline for this feature. :)

• [ ] interactive
• [ ] html
• [ ] url : see https://github.com/rawles/edit.tf/wiki/Teletext-page-hashstring-format