Support different color palettes, specifically for dark background terminal emulators

[nicowilliams]

I use dark background themes on my terminals. In VIM I set bg=dark. The color palette that bitwise uses makes it difficult to see some things (e.g., those in dark blue) on dark bg terms.

Nice tool though!

[mellowcandle]

@nicowilliams can you perhaps attach screen shit so I'll have a reference to you problem?

[nicowilliams]

[nicowilliams]

The dark blue underscores are hard to see. That's basically it. I should write a PR, but I'm heads deep in other code atm.

[mellowcandle]

Ncurses doesn't support so many colors, you can use this page as reference: https://www.linuxjournal.com/content/about-ncurses-colors-0

[mellowcandle]

When you'll have time, feel free to PR.

[nicowilliams]

Will do.