v1.4.7

• Correct handling of EINTR, EAGAIN in read/write functions (unix.c)
• Minor fixes on iwhmap
• Added iwpool_user_data_detach() (iwpool.h)
• Added iwpool_create_empty() (iwpool.h)
• Added simple hashmap implementation (iwhmap.h)
• IWPOOL is able to store associated user data (iwpool.h)
• pthread_barrierattr shim for android API < 24
• Added iwsha256() SHA-256 hash implementation (iwsha2.h)
• Added single thread worker (iwstw.h)
• Added iwstree_clear() (iwstree.h)
• Added iwulist_clear (iwarr.h)
• Added RCIF (basedefs.h)
• Fix assertion error in iwstree_remove() (iwstree.h)
• Allows zero key/value placeholders in iwstree_iter_next() (iwstree.h)
• Added iwstree_put_overwrite (iwstree.h)
• Added iwstree iteration API (iwstree.h)
• Added iwpool_used_size (iwpool.h)
• Added iwstree_int64_cmp (iwstree.h)
• Added IW_DEPRECATED (basedefs.h)