sort-dns: fix scope comparison

#2537

ss: sigv4: disable ctest until new auth available

v4.2.0 release

lws_metrics

There are a few build options that are trying to keep and report
various statistics

 - DETAILED_LATENCY
 - SERVER_STATUS
 - WITH_STATS

remove all those and establish a generic rplacement, lws_metrics.

lws_metrics makes its stats available via an lws_system ops function
pointer that the user code can set.

Openmetrics export is supported, for, eg, prometheus scraping.

libuv: context creation fails via destroy

When using a foreign libuv loop, context creation may fail after adding
handles to the foreign loop... if so, it can no longer deal with the
fatal error by unpicking the created context and returning NULL... it
has to brazen it out with a half-baked context that has already started
the destroy flow and allow the foreign loop to close out the handles
the usual way for libuv.

#2129