message: util: remove unused [U](BEGIN|END) macros
diff: #include <string>
  #include <vector>
  -#define BEGIN(a) ((char*)&(a))
  -#define END(a) ((char*)&((&(a))[1]))
  -#define UBEGIN(a) ((unsigned char*)&(a))
  -#define UEND(a) ((unsigned char*)&((&(a))[1]))
  #define ARRAYLEN(array) (sizeof(array)/sizeof((array)[0]))
  /** Used by SanitizeString() */
  