Solution: fix it to comply with clang-format rules

* Relicensing grant by Ming Ji <jiming@yafco.com>

Permission to relicense under any OSI approved license chosen by the current ZeroMQ BDFL.

Solution: fix them

Problem: PGM receiver can crash due to race

Solution: do not run in_event until restart_input finishes correctly.
Signed-off-by: answeroo <jiming@yafco.com>

Problem: inconsistent _out_pipes when using the same routing id witho…

Solution: added test case, do not erase existing without ZMQ_ROUTER_HANDOVER

Migrate further tests to unity

Solution: migrate to unity

Solution: migrate to unity

Solution: migrate to unity

Solution: migrate to unity

Solution: migrate to unity

Various refactorings

Problem: /Z7 debug info is used only for Debug build, but not for Rel…

Problem: test program test_unbind_inproc is redundant, the same is already tested in test_inproc_connect

Solution: remove test_unbind_inproc

Solution: Migrate to unity assertions and test utils

Solution: apply the same commadn for RelWithDebInfo build

Update unittests/CMakeLists.txt: use ZeroMQ_SOURCE_DIR, ZeroMQ_BINARY_DIR

Solution: add tests/ directory prefix

Use ZeroMQ_SOURCE_DIR, ZeroMQ_BINARY_DIR instead of CMAKE_SOURCE_DIR, CMAKE_BINARY_DIR in tests/CMakeLists.txt
Similar reason to change unittests/CMakeLists.txt

Create RELICENSE/WenbinHou.md

Solution: started migration to unity (run test cases separately)

Solution: add to XFAIL_TESTS until resolved

Solution: extract functions for each protocol

Solution: extract common code

Solution: define and use named constant

Solution: use terms more consistently

Solution: extract resolve_tcp_addr function

Solution: extract into functions of new inprocs_t class

Solution: replace by functional expression

Solution: extract functionality into send_routing_id

Solution: extract functionality into get_effective_conflate_option

Solution: remove it

Solution: remove it

* Add ZMQ_ROUTER_NOTIFY draft socket option

RELICENSE: Szekely Gyorgy

Use ZeroMQ_SOURCE_DIR, ZeroMQ_BINARY_DIR instead of CMAKE_SOURCE_DIR, CMAKE_BINARY_DIR, which allows libzmq to become an "add_subdirectory" target (with static build).
Otherwise, building unittest_xxx would complain header files not found.

Problem: unused get_credential methods and associated fields

Migrate and extend probe router test