New default style limited to basic ANSI colors

[eepykate]

So there is -s [dark|light], I think that should be changed to -s [dark|light|term] where the term option uses color 0-15, which is easier to change than making a json file that only applies to this program.

(Sorry for making 2 issues so fast)

[muesli]

I agree, we should add a default style for the basic ANSI colors.

[maaslalani]

+1 to this request, I think calling it base16 would be appropriate.

[diegodorado]

Another vote for base16