Version 1.10.0 Release

This release fixes some bugs, and adds some APIs that are available in the development 2.0 release,
in order to facilitate migration to 2.0 (which is not released yet.)

At present we have no concrete plans for future releases on the 1.x stable branch, but will release any critically urgent fixes as needed.

What's Changed

• Silence compiler warnings for Windows by @shikokuchuo in #1888
• Mark some interfaces deprecated, fix version number by @gdamore in #1921
• Integer sign extension bug in socket.c. by @gdamore in #1922
• Introduce new API for subscription by @gdamore in #1924
• Fixes for Windows IPC by @gdamore in #1958
• Fix for seg fault (issue #1959), backport fix into stable branch by @aleksejsolovev in #1980
• Adding nng_socket_close by @gdamore in #2065
• Adding new 2.0 transition APIs by @gdamore in #2070

Full Changelog: v1.9.0...v1.10