Colorize logging output

I've mainly modified the lispd_log.h/lispd_log.c and added 2 files, lisp_log_console.[hc] in which colorization can be customized.
Colorization activation can be controlled via a command line switch: --color=auto/always/never.

All the modifications in the other files are just replacement of lispd_log_msg by the macro LISPD_LOG and parameter reordering
If you define #LISPD_DEBUG, then it will prepend the function name to the logger.