With light-on-dark terminal color schemes, 'black bold' (i.e. [30;1m) for
LLL_USER is illegible. I think this would be better as 'default bold' (i.e. [0;1m)
lws_now_usecs() uses monotonic time now. It's not sync'd with
wallclock time and the two can't be mixed. Switch to
gettimeofday which is nonmonotonic and use also for fractional
time to avoid fractional secs in logs being unrelated to integer
seconds boundary.