This change fixes the in-process marshalling of TCP handles on Mac and Linux
that is used to support having multiple threads accepting connections from
multiple loops.
On these two platforms, the ReadStart callback somtimes gets called with a
status and pipe_pending_count equal to zero. Now when the status is zero
just exit the callback without closing the pipe.
This change more closely follows the example at
https://nikhilm.github.io/uvbook/processes.html#sending-file-descriptors-over-pipes
Moves Libuv.dll into nupkg
Uses ILibraryManager to locate location for native libraries
Updates version numbers to 1.0.0-*
Throws exceptions with error text provided by libuv.dll
Bind to ip4 or ip6 endpoints
Getting server defaults from ini
Enabling "Kestrel" to be used as a Main entrypoint