Append rizin results in plaintext to include tabs etc (fixes #3193)

[lionkor]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've updated the documentation with the relevant information (if needed)

Detailed description

See #3193

The output of rizin was formatted as html, which caused \n to become <br/>, making it impossible to just use appendPlainText() as-is. We have to tell rizin not to give us html, so that we can use \t in the output.

Simply replacing \t with spaces,   or similar doesn't work, as the appendHtml() replaces multiple spaces with one.

Test plan (required)

Enter the commands from the issue and others which may generate spaces.

Closing issues

closes #3193

[XVilka]

Look good. I don't recall why HTML was used.
@xarkes @thestr4ng3r any ideas?

[XVilka]

By the way, we should support "true color" (16M colors), not 256 ones in Cutter too, as Rizin works perfectly with various other terminal emulators in this mode.

[xarkes]

I think that in the past it was the easiest way to get formatted output from the core.