Add grant by ninoles

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ed4de883-640b-bf7e-ac56-911e117b649e@tzone.org

problem: zeromq doesn't has a thread-safe peer to peer socket

Solution: a new socket type, called PEER. Very similar to SERVER, but can only connect to other PEERs. Also a new zmq_connect_peer method, that connect and return a routing-id in thread-safe and atomic operation

problem: maximum size of group doesn't match the RFC maximum size

Implement ZMTP 3.1 subscribe/cancel via commands

websocket problems

Solution: return after the fallback

fixes #3809

Grant from KLNikita

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81ce91c8-df40-13c2-7abf-6f648d0b123f@elyzion.net

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

Grant by asafkahlon

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CALFsTFVZLgujRE3V_30G9V9b35kE566K5cWi0vKbNkZGSHrszA@mail.gmail.com

Solution: bump minor version number in the engine as all 3.1 features
are now implemented

Solution: if all peers of a socket are >= 3.1 use sub/cancel commands
instead of the old 0/1 messages.
For backward compatibility, move the handling of 0/1 or sub/cancel
command strings to the encoders, so that the right thing can be done
depending on the protocol version.
Do not set the command flag until the encoder, so that we can handle
the inproc case (which skips the encoder).

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