* Add Python and Redis submodules, and remove old third-party modules
* Update VS projects (WARNING: references files that do not exist yet)
* Update code & add shims for APIs except AF_UNIX/{send,recv}msg()
* Minor style changes.
* windows_intermodule_singleton warning
* Fix some warnings from Visual Studio
* More Visual Studio project changes
* Replace zlib Visual Studio project with stub; it's not needed
* Un-enable link-time code generation