use fci and fcc for read_cb

for now, initialize array here

use common function for initialize callback

remove unused connect_cb zval

don't use magic number

- use fci and fcc instead of zval.

fix typo

fix unexpected key length for php_uv_address_to_zval

refactor resource initializer

use macro instead of copy & paste

fix proto docs

fix arginfo count

add proto docs

update todo [ci skip]

add ./configure --enable-uv-debug option.

change statbuf keys

add poll api

add arginfo

add fs_poll_start/stop functions

change timer cb signature

add several semaphore functions

fix memory leak

add uv_sem_init

add udp_send6 function

missing notification parameter