* object: add OBJ_VAL inline api function;
* object: convert bencode type identifier to predefined macros;
* object: remove type id OBJ_UNSET;
* object: add stdlib.h;
* bencode: add using object module;
* object: rename type id OBJ_MAP to OBJ_DICT;
* bencode: use object module type id;
* bencode: remove bencode type id;
* bencode: add BC_DELIM identifier;
* list: add list module;
* news: update news info;
* object: add using list module;
* object: remove reuse stdlib.h;
* object: remove using memset and memcpy;
* object: remove using string.h;