fix CookieJar process set cookie when value has = & HttpClient support custom headers.Cookie

[nealnote]

1. fix CookieJar process set cookie when value has =
2. fix CookieJar get cookie string, cookie join with ;
3. remove cookie value encode while server give cookie value
4. HttpClient support custom headers.Cookie

[zerodytrash]

thanks, that works.
the only thing we might have to adjust is the compatibility to cookie strings that don't have a space after the semicolon. but that's not important i guess.