change the package name in generated code
fix FullDate timezone bug, use UTC instead
getter: date, year, month, day, dayOfWeek setter: year, month, day function: advance
ClientAPI: use Axios ServerAPI: use @koa/router FullDate: wrapped Date only class APIPromise: enhanced Promise on api response application/json only(multipart/*, image/*, ... are not supported) get, post, put, delete, patch only