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.

Received via email, message-id:

BYAPR08MB506237D85857D053D749888C91000@BYAPR08MB5062.namprd08.prod.outlook.com

Set via github comment:

https://github.com/zeromq/libzmq/pull/1366#issuecomment-581451018

Add relicense from zoobab, acsearle

Solution: remove it, never used

Solution: remove it for now

Adding relicensing grant from FredTreg

Solution: change to conform with naming convention

Add an extra space after "/Z7" in CMakeLists.txt.

Both libzmq and libzmq-static are trying to work in precompiled.pch. …

Add an extra space after "/Z7". Else the flag gets joined with the flag following this and clang-cl does not like that.

Fixes https://github.com/zeromq/libzmq/issues/3776.

Code style improvements