Logical. Should the colors be named using the original
names used by Okabe and Ito (2008), such as "vermillion" (TRUE), or
simplified names, such as "red" (FALSE, default)?
Only used if no colors are specified (to see all available colors).
black_first
Logical. Should black be first (TRUE) or last (FALSE, default)
in the color palette? Only used if no colors are specified (to see all
available colors).
amber
If amber color should replace yellow in the palette.