v0.0.8: Leia compatibility and add "forced" subtitles support

Changelog :

• Fixed compatibility for Leia
• Added support for forced subtitles

Now you can :

• in Subtitles Preferences, for each 3 subtitles, check if Forced type is wanted or not
• in Subtitles Preferences, use a custom pref string to identify forced status (use slash separator), ex : fre/false>eng/false
• in Conditional Subtitle Preferences, for each 3 audio/sub couples, check if Forced type is wanted or not
• (the most interesting IMO) in Conditional Subtitle Preferences, use a custom pref string to identify forced status, ex : eng:fre/false>eng:eng/false>fre:fre/true>fre:non/false
  Combined to audio custom pref familial,children,anytagusedforkids#fre>eng|eng>ger>chi>kor>rus>spa>fre, this is the perfect setup for french speaking original version lovers with kids who speak only french :)