websocket problems

Solution: return after the fallback

fixes #3809

Grant from KLNikita

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solution: if msg is not shared or constant, mask the message in place

Grant by asafkahlon

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support compiling with IBM XL 16.1 w/ clang front end

problem: no docs for scatter-gather

Problem: Documentation for option name mismatch 

Solution: Fix typo

Improve code style, remove duplications in test code

Solution: extract new receive_monitor_address function

Solution: add const where possible

Solution: remove them

RELICENSE pavel-pimenov

Fix intermittent test_monitor and test_security_zap timeouts/deadlocks for now

Problem: intermittent timeouts on test_heartbeats

Solution: wait for monitor to stop resp. unregister monitor before
closing monitored socket.

Problem: curve_encoding_t build fails with old libsodium versions

Solution: add version check and fall back to old implementation for old versions

Problem: on POSIX systems, all tests have a timeout of 60 seconds; disabling it via ZMQ_DISABLE_TEST_TIMEOUT doesn't work anymore

Solution: remove ZMQ_DISABLE_TEST_TIMEOUT guard but add default parameter to setup_test_environment

Solution: increase number of retries when reading monitor event,
and increase timeout

CURVE: Reduce number of memory allocations and message copies

Problem: intermittent timeouts of test_reconnect_ivl

Solution: increase timeout to 15 seconds

Solution: use crypto_box_easy_afternm and crypto_box_open_easy_afternm
in-place

Solution: add CMake option WITH_LIBSODIUM_STATIC

Solution: add initial tests

Grant by jimenezrick, xantares

* Adding permission to relicense for tberkey.
Co-authored-by: bzimmerman-qb <bzimmerman@4qbase.com>

Solution: define NOMINMAX

Solution: extract into separate class curve_encoding_t

Relicense grant received.

This reverts commit d2a8be8d.