Srtgo

- Internalized SRT API (fixed senior ticketing and ticket type issues)
- Fixed Netfunnel code
- Refactored main menu

- Since a large amount of code was refactored, errors may still occur. Please be understanding.

- SRT 열차 예매 시 Netfunnel key 요구 문제 해결 (SRT API 업데이트 전까지 임시 버전)

- SRT: 법인카드 결제

- Support ticketing for disabilities
- SRT: corrected ticket types

- Handles sold out error

- KTX 열차만 선택가능
- 에러 처리 개선