wt-status: add helpers for printing wt-status lines
Introduce status_printf{,_ln,_more} wrapper functions around
color_vfprintf() which take care of adding "#" to the beginning of
status lines automatically. The semantics:
- status_printf() is just like color_fprintf() but it adds a "# "
at the beginning of each line of output;
- status_printf_ln() is a convenience function that additionally
adds "\n" at the end;
- status_printf_more() is a variant of status_printf() used to
continue lines that have already started. It suppresses the "#" at
the beginning of the first line.
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>