Improved livestreamerrc reading.
Improved livestreamerrc reading.

- Now supports comments prefixed with '#'.
- Now handles arguments with no value.

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