Added push/pop/get/set/append_n/remove/extend functions
Added push/pop/get/set/append_n/remove/extend functions

Calling:

    madcrow_buffer(charbuf,String,char);

Creates new functions:

    size_t  charbuf_push        (String *buf, char obj)
    char    charbuf_pop         (String *buf)
    char    charbuf_get         (String *buf, size_t idx)
    void    charbuf_set         (String *buf, size_t idx, obj_t obj)
    size_t  charbuf_append_n    (String *buf, char obj, size_t n)
    void    charbuf_remove      (String *buf, size_t n)
    void    charbuf_extend      (String *buf, size_t n)

noporpoise/madcrowlib