Add a send timeout in expect_bounce_fail()

Set an alarm(60) in setup_test_environment() when not on windows so test...

will not block too long if they go wrong.

failures don't block.

Don't reconnect on protocol errors

Fix bug in reporting protocol errors

Problem: artificial restriction on binary identities

Tell the session why the engine has stopped

Applications that use ZMQ_IDENTITY can be trapped by the artificial
restriction on not using a binary zero as first byte. It's specially
nasty on random generated identities, e.g. UUIDs, as the chance of a
binary zero is low, so it will pass 255 out of 256 times.

Solution: remove the restriction.

CURVE: Implement server-side ERROR handling

CURVE: Implement client-side ERROR handling

Prefix error-reason with length in ERROR command

NULL: Correct ERROR command format

Finish ERROR handling for PLAIN mechanism

PLAIN: Implement ERROR handling in client

test case for zmq_getsockopt/ZMQ_IDENTITY_FD

Simplify VS project configs and harden MSBUILD script

Update cmake, mingw32 and msvc builds

This became necessary after b9c27481

This became necessary after 22d6a974

Batched VS builds, updated libsodium imports