Added a new logoEndAfter game constant, which controls how long
the game logo will stay on screen after booting the game, and
extracted its value for The Vampire Diaries.
Fixed the visual artifacts in the inventory box curtains in The Vampire
Diaries. Renamed the Shades class to Curtains to reflect their name in
the original engine.
Moved all hardcoded engine data that changes between games (e.g. number
of items, number of event flags) to a dedicated file and added a function for
accessing it in NancyEngine.
