Implement basic ANSI escape support in textarea console

[nununoisy]

Implementation of ANSI control sequences in the serial console. The ones that would probably be best to implement in my opinion is ^[J (backspace), ^[2J (clear screen), and ^[[H (cursor home).

I don’t expect a perfect implementation though. Just hard to correct a Linux command when it looks like c[Jat /pr[[[Joc/sysin[[Jfo

[copy]

Good idea.

[nununoisy]

Check this pull request out @copy. Very, very basic but it should work for now.
Not much more can be done unless we add some sort of screen memory for cursor management.
#204

[pitust]

I'd go for using something like xtermjs. It would be way simpler to do than coding it on your own.

[copy]

There's xterm.js support now by passing serial_container_xtermjs: document.getElementById("#xterm") to V86Starter. It's also used on the website (e.g., https://copy.sh/v86/?profile=buildroot has a coloured terminal)