Windows compatibility (#57)

* 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.

src/common/state/redis.c

@@ -4,6 +4,8 @@
 #include <stdbool.h>
 
 #include <stdlib.h>
+/* Including hiredis here is necessary on Windows for typedefs used in ae.h. */
+#include "hiredis/hiredis.h"
 #include "hiredis/adapters/ae.h"
 #include "utstring.h"