termcol: retrieve original iterm colour definitions

Original screenshot apparently included some colour transformation
courtesy of Apple.

Converted from source <https://github.com/gnachman/iTerm2.git>:

perl -MMac::PropertyList=:all -E '
	my $p = parse_plist_file("plists/ColorPresets.plist");
	for my $col ($p->{"Dark Background"}) {
		say join " ", map { parsecolor($col->{"Ansi $_ Color"}) } 0 .. 15;
	}
	sub parsecolor {
		return join "", map {
			sprintf "%02X", $_[0]->{"$_ Component"}->value * 255 + .5
		} qw(Red Green Blue);
	}
'