preproc: New QI_VAARGS_MAP, QI_PAIR_FIRST, QI_PAIR_SECOND

Change-Id: I2474a5000ae19947d1807d5381a81848c5340b8f
Reviewed-on: http://gerrit.aldebaran.lan:8080/17512
Reviewed-by: cgestes <gestes@aldebaran-robotics.com>
Reviewed-by: mnottale <mnottale@aldebaran-robotics.com>
Tested-by: mnottale <mnottale@aldebaran-robotics.com>
QI_PAIR_FIRST: accept any argument count.

Change-Id: I78bc642f86a13aeeb55d1dbc601bdc5392bae075