- added ase_strbytes returning the number of bytes of a '\0'-terminated string
- changed the prototype of ase_map_walker_t to return ase_map_walk_t
- added ASE_MAP_KCLEN and ASE_MAP_VCLEN
- fixed the bug of not initializing the bucket in ase_map_init
- fixed the bug of returning 0 when a match is found in ase_map_search
- fixed the bug of wrongly calculating the value pointer in alloc_pair