Add notebook rendering style, that sets background as black.

[cdmatters]

No description provided.

[heiner]

I'm confused. This isn't normally how one changes the terminal background (e.g. in iterm2, Konsole, etc).

What's the usecase here?

[cdmatters]

I'm confused. This isn't normally how one changes the terminal background (e.g. in iterm2, Konsole, etc).

What's the usecase here?

This is for Jupyter/Colab notebooks.

Libtmt in fact does specify a background color (normally default) but we actually dont collect it in nle.c. We only collect fg and reverse.

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