Exclude MSVC temp files regardless of where they are in builds/msvc

VS set switch /Z7 in debug static (DebugLIB/DebugLTCG) base props.

Extend zmq::wsa_error_to_errno()

The list of error codes is taken from zmq::wsa_error_no(). Most of the
new WSA error codes result in EFAULT, but some return a more specific
value (even EAGAIN).

Fixes #1071

Update VS import props to allow delinking, reset PDB out path change.

Fix for issue https://github.com/zeromq/libzmq/issues/1065

Problem: email addresses in AUTHORS harvested for spam

Solution: remove these email addresses, since authors are reachable
via their Git commit history.

Style fixes

cosmetic msvc xml fix

Fix for perf/platform.hpp not being cleaned up by distclean

Added ProgramDataBaseFile directive

Added ProgramDataBaseFile directive so that .pdb file goes into same directory as the .lib so that debug builds can find it

Add failing test reproducing issue #1015.

Add const qualifier to register_endpoint param

This reverts commit b6c577a9.

Fix race condition in connecting inproc sockets

Minor updates to VS build configuration and NuGet packaging.

Code cleanup

- limit visibility of pending_connection_t
- add const qualifiers

Small code cleanup

- add const modifier to address parameter of event generating functions

Minor fixes

The expect_bounce_fail () helper assumed that messages could always
be sent. However in some cases zmq_send() blocks, due to there not
being any outgoing pipe. This changed in 77f5f7, where previously
there would be a pipe that kept trying to reconnect forever.

Solution: use a send timeout and check for EAGAIN if sending failed.