WINTERMUTE: Don't bother inheriting BaseGame in SubtitleCard
WINTERMUTE: Remove useless default constructor from SubtitleCard.
WINTERMUTE: Const'fy members of class SubtitleCard
WINTERMUTE: Introduce BaseGame->expandStringByStringTable(&Common::String)
WINTERMUTE: Use BaseGame->expandStringByStringTable(&Common::String) in SubtitleCard