Previously the function get_param used a static variable to store
parsed data which is not re-entrant, and thus cause bugs.
1. fix get_param and http_get_param to return pointer and len
2. Remove http_get_param_int
3. Add http_get_param_uintmax
4. Add http_get_param_uint32
5. add http_get_param_node_id
6. add http_get_param_node_type