RegExp: use UTF-8 regexps (off by default)
RegExp: report UTF-8 specific errors
FileItemList: use UTF-8 regexps
CUtil: use UTF-8 regexps for CleanString and ExcludeFileOrFolder
ExternalPlayer::Process: use UTF-8 regexp
PlayerSelectionRule::GetPlayers: use UTF-8 regexp
StackDirectory: use UTF-8 regexp
VideoInfoScanner: use UTF-8 regexp
ScraperParser: use UTF-8 regexp