color: support "default" to restore fg/bg color

The name "default" can now be used in foreground or background colors,
and means to use the terminal's default color, discarding any
explicitly-set color without affecting the other attributes. On many
modern terminals, this is *not* the same as specifying "white" or
"black".

Although attributes could previously be cleared like "no-bold", there
had not been a similar mechanism available for colors, other than a full
"reset", which cannot currently be combined with other settings.

Note that this is *not* the same as the existing name "normal", which is
a no-op placeholder to permit setting the background without changing
the foreground. (i.e. what is currently called "normal" might have been
more descriptively named "inherit", "none", "pass" or similar).

Signed-off-by: Robert Estelle <robertestelle@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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