[보안패치]그누보드(영카트) 5.6.15

# 변경된 사항

버전 5.6.15 수정
https://github.com/gnuboard/gnuboard5/commit/5da91ab73e5928acbd79969c4055bfda90448f43

create_hash 함수에 fclose 코드 추가
https://github.com/gnuboard/gnuboard5/commit/d5b541724fa687f5a6ef118d4580b76be1329de3

NHN_KCP 네이버페이 간편결제 카드 또는 머니결제로 분리
https://github.com/gnuboard/gnuboard5/commit/9758007f910fd4a38be73b996c27c4cde2e95785

관리자 로그인시 새글 테이블 OPIMIZE 실행시 딜레이 되는 문제 개선2
https://github.com/gnuboard/gnuboard5/commit/9d5f8e137fb7a83b89f9db15f0dbf05633f7459c

Open redirect 취약점 수정
https://github.com/gnuboard/gnuboard5/commit/f1da95f055d6ce22b839eb5272aa02778faee371

php warning 메시지 코드 수정
https://github.com/gnuboard/gnuboard5/commit/9602f3c7a7118948d6f31cb39885ca8df63d9ac3

insert_use_point 함수에 hook 추가 #363
https://github.com/gnuboard/gnuboard5/commit/a9eab8d86ae0ce0805cfdb786ad2f1e33f3a80ac

db_table.optimize.php 파일에 hook 추가 #362
https://github.com/gnuboard/gnuboard5/commit/9191199ef4ad0703e1b74a9863dfbceceb230d2a

url_auto_link함수에 url_auto_link_before hook 추가 #361
https://github.com/gnuboard/gnuboard5/commit/255675353052818d484ccaf55f4d63b40367f4a8

토스페이먼츠 머트키 확인방법 설명문 수정
https://github.com/gnuboard/gnuboard5/commit/57983a6dbc6d1282473f6972ec2a40f90681004f

feat: add list.php theme override (#358)
https://github.com/gnuboard/gnuboard5/commit/327e7ba7ba1ee84b35650aaa73a7526d2b96ebbc

get_uniqid 함수에 hook 추가
https://github.com/gnuboard/gnuboard5/commit/67415cf8d36dd4ab7ed4a89b7ba8d8d47f3836d9