Feature: Use semantic colors instead of making assumptions about hues

[joshgoebel]

Ref:

• https://github.com/base16-project/base16/issues/10
• https://github.com/base16-project/base16/issues/11

Should prefer semantic term01 colors (or some other solution) rather than assuming hues... ie, we should not assume that base08 is RED. To have anything resembling a "normal" terminal palette (which some may desire) right now one is forced to use specific hues for base08-base0F, this should not be required.

Also the current mapping seems pretty arbitrary given that the style spec says nothing at all (that I can see) about guaranteed hues - I assume we're getting this current mapping only from the default Base16 theme...

Alternatives considered

Different schemes per template (to allow mapping colors differently per template):

• nord-terminal-scheme
• nord-vscode-scheme

But doesn't that kind of defeat the purpose?