feat: process colored output from execution output

[mfontanini]

This processes execution output's ansi escape codes and turns them into WeightedTexBlock. This can then be rendered so that we:

• Get colored output automatically.
• Handle lines that are too long to fit on the screen automatically.

This needs more testing, I just tested a couple of commands and it works fine but I didn't thoroughly test yet.

This is based on the initial work done on #296.

cc @DrunkenToast @calebdw I would appreciate if you could give this PR a test. It's only handling a very tiny subset of escape codes so I wouldn't be surprised if something failed. At least I tried basic things like ls --color=always and piping stuff to lolcat and they both seem to work fine to me.

[DrunkenToast]

Overall looks really good!
I did find an edgecase that doesn't behave like my shell:

Shell:

printf "\033[31;1;4mColors should get reset but not the underline:\n"

cowsay "Should get underlined but isn't" | lolcat -f

I don't immediately see a reason in this PR that would cause the issue, so I would assume it's somewhere in the renderer.

[calebdw]

@mfontanini,

It looks pretty good to me as far as most use-cases go! I did notice it has trouble wrapping but looks like that's related to #289

[DrunkenToast]

@mfontanini,

It looks pretty good to me as far as most use-cases go! I did notice it has trouble wrapping but looks like that's related to #289

This might actually be a bit problematic for some people. Codeblocks you can manually chunk up, but output of said codeblock is not as easy.
The advantage of the previous method was that it was chunked up beforehand with context of the maximum width.

[mfontanini]

Nice, thanks for testing it! Will fix both issues.

Codeblocks you can manually chunk up, but output of said codeblock is not as easy.

Don't worry, I won't merge until this is fixed. This should not look this way. Btw the changes that I'm adding here will allow simplifying a bunch of things + I think will allow fixing the other issue you created re: splitting long code snippet lines.

[mfontanini]

Alright, both issues are fixed:

[calebdw]

That was fast!

[mfontanini]

Merging, if anything comes out I can re-visit. There's lots of escape codes missing here so it's possible the output of some tools won't look right.