* feat(core): connect to danmaku server with buvid3 * make buvid3 nullable & add json serializer setting * fix test * fix regex & make regex static * remove anonHttpClient * remove MainHttpClient * split FetchAsTextAsync * GetAnonymousCookieAsync * use template string in TestCookieAsync * fix test * background get anonymous cookie * make jsonSerializerSettings static * fix uid parse logic * fix buvid match * remove GetAnonCookie * restore merge typo * fix comment * rename ICookieTester
* danmaku: get svr with ck & conn with uid from ck * apply code chagnes for pr * fix bug and add description in advanced settings * fix test --------- Co-authored-by: genteure <genteure@gmail.com>