plugins.weeb: Refactor to use the validation API.
plugins.weeb: Refactor to use the validation API.

Klaudit/livestreamer,chhe/livestreamer,javiercantero/streamlink,ethanhlc/streamlink,caorong/livestreamer,ethanhlc/streamlink,blxd/livestreamer,sbstp/streamlink,Saturn/livestreamer,derrod/livestreamer,hmit/livestreamer,lyhiving/livestreamer,back-to/streamlink,Saturn/livestreamer,wolftankk/livestreamer,Dobatymo/livestreamer,programming086/livestreamer,sbstp/streamlink,caorong/livestreamer,wlerin/streamlink,programming086/livestreamer,charmander/livestreamer,Masaz-/livestreamer,chhe/streamlink,Dobatymo/livestreamer,chrippa/livestreamer,streamlink/streamlink,intact/livestreamer,intact/livestreamer,beardypig/streamlink,bastimeyer/streamlink,melmorabity/streamlink,mmetak/streamlink,javiercantero/streamlink,charmander/livestreamer,okaywit/livestreamer,chhe/livestreamer,flijloku/livestreamer,flijloku/livestreamer,derrod/livestreamer,back-to/streamlink,Klaudit/livestreamer,jtsymon/livestreamer,wolftankk/livestreamer,melmorabity/streamlink,fishscene/streamlink,beardypig/streamlink,Feverqwe/livestreamer,hmit/livestreamer,streamlink/streamlink,okaywit/livestreamer,chrippa/livestreamer,mmetak/streamlink,gravyboat/streamlink,blxd/livestreamer,chhe/streamlink,Masaz-/livestreamer,bastimeyer/streamlink,fishscene/streamlink,gtmanfred/livestreamer,gtmanfred/livestreamer,gravyboat/streamlink,Feverqwe/livestreamer,lyhiving/livestreamer,jtsymon/livestreamer,wlerin/streamlink